Gold – soon to be available in colors other than gold

<!DOCTYPE html> <html> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("http://www.gizmag.com/color-changing-gold/24698/","20140715043402","https://web.archive.org/","web","/_static/", "1405398842"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" />  <title>Gold – soon to be available in colors other than gold</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <meta name="robots" content="index,follow"/> <meta name="description" content="Scientists have developed a new process for changing the surface color of gold and other metals."/> <meta name="keywords" content="Gold,University of Southampton,Color,Science"/> <meta name="news_keywords" content="Gold, University of Southampton, Color"/> <meta name="twitter:card" content="summary_large_image"/> <meta name="twitter:site" content="@gizmag"/> <meta name="twitter:creator" content="@bencoxworth"/> <meta name="twitter:title" content="Gold – soon to be available in colors other than gold"/> <meta name="twitter:description" content="Scientists have developed a new process for changing the surface color of gold and other metals. "/> <meta name="twitter:image:src" content="http://images.gizmag.com/hero/goldcolor.jpg"/> <meta name="twitter:domain" content="gizmag.com"/> <link rel="canonical" href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/color-changing-gold/24698/"/> <link rel="image_src" href="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/hero/goldcolor.jpg"/> <link rel="alternate" media="handheld" href="https://web.archive.org/web/20140715043402/http://m.gizmag.com/article/24698"/> <link rel="stylesheet" type="text/css" href="https://web.archive.org/web/20140715043402cs_/http://files.gizmag.com/static_styles.min.css?x=1405378822"/> <link rel="stylesheet" type="text/css" href="/web/20140715043402cs_/http://www.gizmag.com/css/dynamic_styles.php?x=1405378822"/> <script src="/web/20140715043402js_/http://www.gizmag.com/inc/css_browser_selector.js" type="text/javascript"></script> <link rel="alternate" type="application/rss+xml" href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/xml/" title="Gizmag Emerging Technology Magazine"/> <link rel="shortcut icon" href="/web/20140715043402im_/http://www.gizmag.com/images/favicon.ico"/> <link rel="apple-touch-icon" href="/web/20140715043402im_/http://www.gizmag.com/images/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/web/20140715043402im_/http://www.gizmag.com/images/apple-touch-icon-precomposed.png"/>   <script type="text/javascript"> var googletag = googletag || {}; googletag.cmd = googletag.cmd || []; (function() { var gads = document.createElement("script"); gads.async = true; gads.type = "text/javascript"; var useSSL = "https:" == document.location.protocol; gads.src = (useSSL ? "https:" : "http:") + "//web.archive.org/web/20140715043402/http://www.googletagservices.com/tag/js/gpt.js"; var node = document.getElementsByTagName("script")[0]; node.parentNode.insertBefore(gads, node); })(); </script>  <script type="text/javascript"> googletag.cmd.push(function() { gpt_leaderboard = googletag.defineSlot('/1007667/ca-pub-1607124478120364/Science_Leaderboard_Top_728x90', [728,90], 'leaderboard') .addService(googletag.pubads()); gpt_hmpg_970 = googletag.defineSlot('/1007667/ca-pub-1607124478120364/pushdown', [[970,90], [970,250]], 'pushdown') .addService(googletag.pubads()); gpt_islandtr = googletag.defineSlot('/1007667/ca-pub-1607124478120364/Science_IslandTop_Right_300x250', [[300,250], [336,280], [300,600], [300,1050]], 'island_top_right') .addService(googletag.pubads()); gpt_islandbr = googletag.defineSlot('/1007667/ca-pub-1607124478120364/Science_IslandBottom_Right_300x250', [[300,250], [336,280], [300,600]], 'island_bottom_right') .addService(googletag.pubads()); gpt_skyscraper = googletag.defineSlot('/1007667/ca-pub-1607124478120364/Science_Skyscraper_Right_160x600', [160,600], 'skyscraper_right') .addService(googletag.pubads()); gpt_article_fllwr = googletag.defineSlot('/1007667/ca-pub-1607124478120364/Article_300x600_Follower', [300,600], 'article_follower') .addService(googletag.pubads()); gpt_bottom_inc = googletag.defineSlot('/1007667/ca-pub-1607124478120364/bottom_include', [1,1], 'bottom_include') .addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.pubads().setTargeting('pt', 'a'); googletag.pubads().collapseEmptyDivs(); googletag.pubads().set('page_url','https://web.archive.org/web/20140715043402/http://www.gizmag.com/color-changing-gold/24698/'); googletag.enableServices(); }); </script>  <script class="kxct" data-id="JG_lk_oI" data-timing="async" data-version="1.9" type="text/javascript"> window.Krux||((Krux=function(){Krux.q.push(arguments)}).q=[]); (function(){ var k=document.createElement('script');k.type='text/javascript';k.async=true; var m,src=(m=location.href.match(/\bkxsrc=([^&]+)/))&&decodeURIComponent(m[1]); k.src = /^https?:\/\/([a-z0-9_\-\.]+\.)?krxd\.net(:\d{1,5})?\//i.test(src) ? src : src === "disable" ? "" : (location.protocol==="https:"?"https:":"http:")+"//web.archive.org/web/20140715043402/http://cdn.krxd.net/controltag?confid=JG_lk_oI" ; var s=document.getElementsByTagName('script')[0];s.parentNode.insertBefore(k,s); }()); </script>  <script src="//web.archive.org/web/20140715043402js_/http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script> <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/global_public.js?1404869523"></script> <script type="text/javascript"> $jqr(function () { $jqr('#mobile-link').click(function(){ document.cookie="view=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/"; location.reload(); }); $jqr('#desktop-link').click(function(){ document.cookie="view=desktop; path=/"; location.reload(); }); }); </script> <script type="text/javascript">var switchTo5x=true;</script> <script type="text/javascript" src="https://web.archive.org/web/20140715043402js_/http://w.sharethis.com/button/buttons.js"></script> <script type="text/javascript">stLight.options({publisher: "7fc0c4fe-87f7-4d5d-a8b9-b091a9ac5e80", doNotHash: true, doNotCopy: true, shorten: false, hashAddressBar: false});</script> <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/jquery.sticky.js"></script> <script> $jqr(document).ready(function(){ $jqr("#article_follower").sticky({topSpacing:15, bottomSpacing:835}); }); </script> </head> <body> <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/login_comments.js?1404869523"></script>  <div id="fb-root"></div> <script> window.fbAsyncInit = function() { FB.init({ appId: '38456013908', status: true, cookie: true, xfbml: true, oauth: true, channelUrl: window.location.protocol + '//web.archive.org/web/20140715043402/http://www.gizmag.com/fb_channel.php' //channel file to avoid cross domain communication issues }); FB.Event.subscribe('auth.logout', function(response) { if(response.authResponse===null){ //user is logging out of facebook logoutUser(); } }); }; // Load the SDK Asynchronously (function(d){ var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0]; if (d.getElementById(id)) {return;} js = d.createElement('script'); js.id = id; js.async = true; js.src = "//web.archive.org/web/20140715043402/http://connect.facebook.net/en_US/all.js"; ref.parentNode.insertBefore(js, ref); }(document)); var $jqr = jQuery.noConflict(); $jqr(document).ready(function() { var fbuser = checkFBUser(); }); </script>   <script> window.Krux||((Krux=function(){Krux.q.push(arguments);}).q=[]); (function(){ function retrieve(n){ var m, k='kx'+n; if (window.localStorage) { return window.localStorage[k] || ""; } else if (navigator.cookieEnabled) { m = document.cookie.match(k+'=([^;]*)'); return (m && unescape(m[1])) || ""; } else { return ''; } } Krux.user = retrieve('user'); Krux.segments = retrieve('segs') && retrieve('segs').split(',') || []; })(); </script>  <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-2235360-4']); _gaq.push(['_setCustomVar', 1, 'Section','Science',3 ]); _gaq.push(['_setCustomVar', 2, 'Writer', 'Ben Coxworth', 3 ]); _gaq.push(['_setCustomVar', 4, 'PPV_test3', '1', 3 ]); _gaq.push(['_setCustomVar', 5, 'ArticleID', '24698', 3 ]); _gaq.push(['_setCustomVar', 3, 'View', 'Article', 3 ]); _gaq.push(['_trackPageview']); _gaq.push(['_trackPageLoadTime']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://' : 'http://') + 'stats.g.doubleclick.net/dc.js'; (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(ga); })(); </script>  <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/ga_social_tracking_min.js"></script>  <div class="index" id="top_index"> <div class="index_center"> <ul class="header_links float_left"> <li><a href="https://web.archive.org/web/20140715043402/http://www.youtube.com/user/gizmag" title="Gizmag's YouTube Channel"><img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/layout/icons/iconmonstr-youtube-icon-48.png"></a></li> <li><a href="https://web.archive.org/web/20140715043402/http://twitter.com/gizmag/" title="Follow Gizmag on Twitter"><img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/layout/icons/iconmonstr-twitter-icon-48.png"></a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.stumbleupon.com/to/stumble/stumblethru:gizmag.com?utm_source=GizMag&utm_medium=StumbleThru&utm_campaign=StumbleThruButton" title="Explore Gizmag" rel="nofollow"><img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/layout/icons/iconmonstr-stumbleupon-icon-48.png"></a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/xml/" title="Subscribe to Gizmag's RSS feed"><img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/layout/icons/iconmonstr-rss-icon-48.png"></a></li> <li><a href="https://web.archive.org/web/20140715043402/http://store.gizmag.com/" title="Shop at the Gizmag store"><img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/layout/icons/iconmonstr-shopping-cart-3-icon-48.png"></a></li> </ul>   <div id="search_form_top"> <form action="https://web.archive.org/web/20140715043402/http://www.gizmag.com/search/" id="cse-search-box-top"> <div> <input type="hidden" name="cx" value="partner-pub-1607124478120364:cf1bgg5f284"/> <input type="hidden" name="cof" value="FORID:11"/> <input type="hidden" name="ie" value="ISO-8859-1"/> <input type="text" name="q" size="28" class="gsearch"/> <input type="submit" name="sa" value="Search"/> </div> </form> <script type="text/javascript" src="https://web.archive.org/web/20140715043402js_/http://www.google.com/cse/brand?form=cse-search-box-top&lang=en"></script> </div> </div> </div>  <div id="top_strip"><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/tag/product-comparison/" target="_blank">Shopping? Check out our latest product comparisons</a></div> <div class="center" id="main-content"> <div id="header"> <a href="/web/20140715043402/http://www.gizmag.com/" id="logo"></a> <div id="leaderboard" data-cb-ad-id="Leaderboard"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display("leaderboard"); }); </script> </div> </div> <div id="pushdown" data-cb-ad-id="Pushdown"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display("pushdown"); }); </script> </div>  <div id="top_stories"> <ul> <li id="top_story0"> <a class="ts_img" href="/web/20140715043402/http://www.gizmag.com/firefly-alpha-aerospike-launch-vehicle/32892/" title="Firefly Space Systems unveils Alpha launch vehicle design with aerospike engine"></a> <div class="ts_title"> <a href="/web/20140715043402/http://www.gizmag.com/firefly-alpha-aerospike-launch-vehicle/32892/">Firefly Space Systems unveils Alpha launch vehicle design with aerospike engine</a> </div> </li> <li id="top_story1"> <a class="ts_img" href="/web/20140715043402/http://www.gizmag.com/boeing-space-bins-carry-on-luggage/32934/" title="Boeing increases carry-on capacity with new Space Bins"></a> <div class="ts_title"> <a href="/web/20140715043402/http://www.gizmag.com/boeing-space-bins-carry-on-luggage/32934/">Boeing increases carry-on capacity with new Space Bins</a> </div> </li> <li id="top_story2"> <a class="ts_img" href="/web/20140715043402/http://www.gizmag.com/smartphone-sensor-crowdsourced-pollution-map-karlsruhe/32932/" title="Smartphone sensor generates crowdsourced pollution maps"></a> <div class="ts_title"> <a href="/web/20140715043402/http://www.gizmag.com/smartphone-sensor-crowdsourced-pollution-map-karlsruhe/32932/">Smartphone sensor generates crowdsourced pollution maps</a> </div> </li> <li id="top_story3"> <a class="ts_img" href="/web/20140715043402/http://www.gizmag.com/nuseti-inner-drive-system-mountain-bike/32914/" title="Nuseti mountain bike features a sealed drivetrain"></a> <div class="ts_title"> <a href="/web/20140715043402/http://www.gizmag.com/nuseti-inner-drive-system-mountain-bike/32914/">Nuseti mountain bike features a sealed drivetrain</a> </div> </li> <li id="top_story4"> <a class="ts_img" href="/web/20140715043402/http://www.gizmag.com/jaguar-land-rover-virtual-windscreen-concept/32930/" title="Jaguar Virtual Windscreen concept looks to the future of HUDs"></a> <div class="ts_title"> <a href="/web/20140715043402/http://www.gizmag.com/jaguar-land-rover-virtual-windscreen-concept/32930/">Jaguar Virtual Windscreen concept looks to the future of HUDs</a> </div> </li> </ul> <div id="more_top_stories"> <a id="mts_img" href="/web/20140715043402/http://www.gizmag.com/top_stories/"></a> <a id="mts_txt" href="/web/20140715043402/http://www.gizmag.com/top_stories/">more top stories</a> </div> <div class="clear_both"></div> </div> <div id="content" class="narrow_content"> <div id="article_top" class="summary_details" data-article="24698">  <div class="sd_top"> <a class="vsmall" href="/web/20140715043402/http://www.gizmag.com/science/" style="float: left; margin-right: 9px;">SCIENCE</a> </div>  <h1 id="ar_title">Gold – soon to be available in colors other than gold</h1> <div class="summary_details_left"> <p>By <a href="/web/20140715043402/http://www.gizmag.com/author/ben-coxworth/" rel="author">Ben Coxworth</a></p> <p><em>October 24, 2012</em></p> </div> <div class="summary_details_right"> <div class="has_comments"><a href="color-changing-gold#comments">12 Comments</a></div> </div> </div>  <div id="hero_box" style="width: 530px;"> <a id="hero_link" href="/web/20140715043402/http://www.gizmag.com/color-changing-gold/24698/pictures"> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/hero/goldcolor.jpg" title="Scientists have developed a new process for changing the surface color of gold and other m..." width="530" height="297" alt="Scientists have developed a new process for changing the surface color of gold and other m..."/> </a> <div class="pic_caption"> <p>Scientists have developed a new process for changing the surface color of gold and other metals (Image: <a href="https://web.archive.org/web/20140715043402/http://www.shutterstock.com/pic.mhtml?id=54102721" target="_blank">Shutterstock</a>) </p> </div> <div class="clear_both"></div> </div> <div class="article_body"> <div id="top_unit"></div> <p>Although a great many people like the “prestige” that comes with the natural color of their gold jewelry, teeth or <a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/gold-plated-vacuum-cleaner/23216/" target="_blank">vacuum cleaners</a>, things are about to get a little more complicated – scientists from the University of Southampton have now devised a technique that causes gold (or other metals) to be seen in a variety of other colors ... green gold, anyone?</p> <p>Unlike processes such as anodizing, in which colored films are added to metal surfaces, the Southampton technology works by actually altering the gold itself. Tiny raised or indented patterns are embossed onto its surface, changing the way that it absorbs and reflects light. Depending on the shape, height and/or depth of the pattern, that reflected light can be seen as any one of a number of colors. Different patterns could even be applied to the same object, causing different parts of it to take on different colors.</p> <p>“This is the first time the visible color of metal has been changed in this way,” said project leader Prof. Nikolay Zheludev. “The colors of the objects we see all around us are determined by the way light interacts with those objects. For instance, an object that reflects red light but absorbs other wavelengths will appear red to the human eye.”</p> <p>Other metals, such as silver and aluminum, can also be “colorized” using the technique. Along with its obvious applications in fields like jewelry-making, it has been suggested that the technology could additionally find use in making items such as banknotes harder to forge.</p> <p>The patterns are presently being applied using an existing technique known as ion beam milling, which is described as being similar to sand-blasting on the atomic scale. However, the scientists believe that industrial-scale processing would be possible via methods such as nano-imprint, in which a master template is used to stamp out patterns on surfaces.</p> <p>The university has filed for a patent on the technology, and is looking into its commercialization.</p> <p>Source: <a href="https://web.archive.org/web/20140715043402/http://www.southampton.ac.uk/" target="_blank">University of Southampton</a></p>  <div id="sharethis_container" style="margin: 20px 0"> <span class="st_twitter_large" displaytext="Tweet" st_via="gizmag"></span> <span class="st_facebook_large" displaytext="Facebook"></span> <span class="st_googleplus_large" displaytext="Google +"></span> <span class="st_linkedin_large" displaytext="LinkedIn"></span> <span class="st_pinterest_large" displaytext="Pinterest"></span> </div>   <div id="fm-well-zone" data-cb-ad-id="Content Well 1"> <script type="text/javascript" src="https://web.archive.org/web/20140715043402js_/http://static.fmpub.net/zone/7980"></script> </div> <div id="bottom_unit" data-cb-ad-id="Content Well 2"></div>  <div style="margin-bottom: 20px"> <div class="OUTBRAIN" data-src="https://web.archive.org/web/20140715043402oe_/http://www.gizmag.com/color-changing-gold/24698/" data-widget-id="AR_1" data-ob-template="Gizmag"></div> <script type="text/javascript" async="async" src="https://web.archive.org/web/20140715043402js_/http://widgets.outbrain.com/outbrain.js"></script> </div> </div>  <span class="title clear_left" id="author_byline_title">About the Author</span> <div class="dotsontop" id="authorcontainer">  <a href="/web/20140715043402/http://www.gizmag.com/author/ben-coxworth/"> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/author_profiles/127.jpg" alt="Ben Coxworth" id="bio_pic"/> </a>   An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away.   <a href="/web/20140715043402/http://www.gizmag.com/author/ben-coxworth/">All articles by Ben Coxworth</a> <span id="author_byline_links">    <a href="https://web.archive.org/web/20140715043402/http://twitter.com/bencoxworth" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @bencoxworth</a> </span> <br class="clear_both"> </div>  <div id="tags"> <span class="title">Tags</span> <div class="dotsontop"> <ul> <li>» <a href="/web/20140715043402/http://www.gizmag.com/tag/color/" rel="tag">Color</a></li> <li>» <a href="/web/20140715043402/http://www.gizmag.com/tag/gold/" rel="tag">Gold</a></li> <li>» <a href="/web/20140715043402/http://www.gizmag.com/tag/unversity+of+southampton/" rel="tag">University of Southampton</a></li> </ul> <div class="clear_both"></div> </div> </div> <div id="bing_unit"></div>  <span class="title" id="comments">12 Comments</span> <div class="dotsontop"> <div id="comment-171145" class="a_comment"> <p>That's not gold, It's Kryptonite! RUN SUPERMAN RUN!!! </p> <span class="name">Derek Howe</span><br> <span class="date"> 24th October, 2012 @ 03:55 pm PDT</span> </div> <div id="comment-171232" class="a_comment"> <p>Now, look, I don't mean to be pedantic or anything, but the color of gold... is gold. That's why it's called gold. What YOU have discovered, if it has a name, is some...Green. </p> <span class="name">Stratosfire</span><br> <span class="date"> 25th October, 2012 @ 04:18 am PDT</span> </div> <div id="comment-171298" class="a_comment"> <p>Aluminum anodyzing is not a film. It is a porous, but thickened layer of aluminum oxide (sapphire) with a penetrating dye if color is wanted. </p> <span class="name">Bob Stuart</span><br> <span class="date"> 25th October, 2012 @ 08:24 am PDT</span> </div> <div id="comment-171430" class="a_comment"> <p>And now the team is working on how to make diamonds look like glass. </p> <p>8^) </p> <span class="name">warren52nz</span><br> <span class="date"> 25th October, 2012 @ 01:44 pm PDT</span> </div> <div id="comment-171433" class="a_comment"> <p>Careful Bob. Anodize isn't saphhire but a hydrated oxide of aluminum. We denote sapphire and ruby as different gems though they are single crystals of aluminum oxide with different impurities to give color. </p> <p></p> <p>Gold can also look green if it's very very thin. Noticed this when gold coating electron microscope samples years back. Maybe some optics expert/nano expert can comment on that. Have to wonder if each metal has it's own characteristic color palette available. </p> <span class="name">joez</span><br> <span class="date"> 25th October, 2012 @ 01:45 pm PDT</span> </div> <div id="comment-171445" class="a_comment"> <p>An interference filter...big woop. </p> <p></p> <p>Besides, just TRY and give her a GREEN ring, ya boffins </p> <span class="name">solutions4circuits</span><br> <span class="date"> 25th October, 2012 @ 02:07 pm PDT</span> </div> <div id="comment-171604" class="a_comment"> <p>NOVA Science Now just had a show on this tonight, making things smaller. It explained why gold makes red glass. </p> <p></p> <p>Nanoparticles. Get particles of gold small enough and they don't reflect yellow light but still reflect red light. </p> <p></p> <p>Alter the surface structure of gold just right and the spectrum of light it reflects best is altered. </p> <p></p> <p>The problem with a technique like this on a soft metal is it won't be damage resistant. Dents and scratches will obliterate the micro patterns and reflect the natural yellow color of gold. </p> <p></p> <p>Canada's mint already used a process like this to impress holograms onto the surface of .9999 fine gold coins. Regular .999 fine gold wasn't soft enough. Don't touch them, the oil from your fingers could fill in the micro patterns. Getting them clean without wrecking the hologram, not easy. </p> <span class="name">Gregg Eshelman</span><br> <span class="date"> 26th October, 2012 @ 12:51 am PDT</span> </div> <div id="comment-171616" class="a_comment"> <p>This is just palin stupid. This is first of all a "technology" well known from nature. Butterflies wings appear colored due to sub-wavelength patterns. People have also utilized that by molding metals from actual butterfly wings. </p> <p>And it has been done by nano lithography without the use of actual butterfly wings. </p> <p></p> <p>One applicaion close to commercial use is the black silicon used to enhance efficiency of solar cells. In that case silicon is patterned with sub-wavelength patterns to reduce reflections to a minimum. And due to that the otherways metallic silvery look of silicon becomes black since it is reflecting a minimum amount of light. </p> <p></p> <p>So good luck with that patent.... unless it is a patent for the method of producing this for commercial applications. </p> <span class="name">D-man</span><br> <span class="date"> 26th October, 2012 @ 02:55 am PDT</span> </div> <div id="comment-171817" class="a_comment"> <p>Oxide layers can be used to create colour in many metals. The technique above could make coins hard to replicate, but would require some protection against wear, and would have to be easy to distinguish from other cheaper techniques that could be used for forgery. </p> <span class="name">Charles Bosse</span><br> <span class="date"> 26th October, 2012 @ 10:39 am PDT</span> </div> <div id="comment-172921" class="a_comment"> <p>Gold doesn't oxidize, which is one of the reason's it has been a prized metal for thousands of years. </p> <span class="name">Gregg Eshelman</span><br> <span class="date"> 30th October, 2012 @ 07:59 pm PDT</span> </div> <div id="comment-303580" class="a_comment"> <p>Sub-wavelength patterns in gold are more durable than butterfly wings, but still soft. A bump will flatten the pattern and change the color. </p> <span class="name">SuperFool</span><br> <span class="date"> 17th April, 2014 @ 11:24 pm PDT</span> </div> <div id="comment-303868" class="a_comment"> <p>There’s a university in Rochester that developed a way to blacken metal using a laser, sounds similar. </p> <span class="name">William Carr</span><br> <span class="date"> 21st April, 2014 @ 04:52 pm PDT</span> </div> </div> <span class="title">Post a Comment</span> <div class="dotsontop" id="comment_form_div"> <div id="comment_form" data-article="24698"> <div id="comments_login"> <form action="/web/20140715043402/http://www.gizmag.com/index.php" name="login_form" id="login_form" onsubmit="return false;"> <p class="bold">Login with your gizmag account:</p> <p id="login_status"></p> <label for="email">Email</label><input type="text" name="email" id="email" value=""/> <label for="password">Password</label><input type="password" name="password" id="password" value=""/> <input type="submit" value="Log In" class="med"/> <div id="options"> <a href="/web/20140715043402/http://www.gizmag.com/register/">Register here</a><br> <a href="/web/20140715043402/http://www.gizmag.com/new_password/">Forgotten your password?</a> </div> <input type="hidden" id="expired_comment" value=""/> </form> </div> <div id="facebook_login"> <p>Or <span class="bold">Login with Facebook:</span></p><br/> <div class="fb-login-button" data-scope="email" data-max-rows="1" data-onlogin="loginFUser(24698);" data-autologoutlink="true"></div> </div> </div> <div class="clear_both"></div> </div>  <span class="title">Related Articles</span> <div id="related_articles" class="dotsontop"> <ul> <li> <a href="/web/20140715043402/http://www.gizmag.com/alloys-with-gold-like-properties-developed/16656/" title="Gold-plated contacts in electronic devices could be about to lose their sheen thanks to th..."> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/related/goldlikealloys.jpg" alt="Gold-plated contacts in electronic devices could be about to lose their sheen thanks to th..."/> </a> <a class="rel_title" href="/web/20140715043402/http://www.gizmag.com/alloys-with-gold-like-properties-developed/16656/">New alloys mean all that glitters need not be gold for electronic applications </a> <p class="rel_date">14th October, 2010</p> </li> <li> <a href="/web/20140715043402/http://www.gizmag.com/forensic-scientists-successfully-recover-fingerprints-from-clothing/17763/" title="Forensic researchers have had early success refining a method normally used to recover fin..."> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/related/clothesprint-1.JPG" alt="Forensic researchers have had early success refining a method normally used to recover fin..."/> </a> <a class="rel_title" href="/web/20140715043402/http://www.gizmag.com/forensic-scientists-successfully-recover-fingerprints-from-clothing/17763/">Researchers able to lift fingerprints from clothing</a> <p class="rel_date">2nd February, 2011</p> </li> <li> <a href="/web/20140715043402/http://www.gizmag.com/24-carat-gold--and-platinum-leafed--aston-martin-db7/10378/" title="24 carat Gold- and Platinum-leafed Aston Martin DB7 "> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/related/10378_17110872709.jpg" alt="24 carat Gold- and Platinum-leafed Aston Martin DB7 "/> </a> <a class="rel_title" href="/web/20140715043402/http://www.gizmag.com/24-carat-gold--and-platinum-leafed--aston-martin-db7/10378/">24 carat Gold- and Platinum-leafed Aston Martin DB7 </a> <p class="rel_date">17th November, 2008</p> </li> <li> <a href="/web/20140715043402/http://www.gizmag.com/gold-nanospheres-search-out-and-cook-cancer-cells-11125/11125/" title="Partial view of a gold nanosphere magnified by a factor of one billion. The darker ring sh..."> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/related/gold-nanospheres-search-out-and-cook-cancer-cells.jpg" alt="Partial view of a gold nanosphere magnified by a factor of one billion. The darker ring sh..."/> </a> <a class="rel_title" href="/web/20140715043402/http://www.gizmag.com/gold-nanospheres-search-out-and-cook-cancer-cells-11125/11125/">Gold nanospheres search out and ‘cook’ cancer cells</a> <p class="rel_date">23rd March, 2009</p> </li> <li> <a href="/web/20140715043402/http://www.gizmag.com/japanese-scientist-artificial-palladium/17438/" title="Palladium electron shell (Image: Pumbaa via Wikimedia, CC 2.0) "> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/related/palladium-1.jpg" alt="Palladium electron shell (Image: Pumbaa via Wikimedia, CC 2.0) "/> </a> <a class="rel_title" href="/web/20140715043402/http://www.gizmag.com/japanese-scientist-artificial-palladium/17438/">Japanese scientists produce artificial palladium</a> <p class="rel_date">3rd January, 2011</p> </li> <li> <a href="/web/20140715043402/http://www.gizmag.com/super-twisted-light-disease-identification-world-first/16856/" title="World first 'super twisted' light boosts disease identification"> <img src="https://web.archive.org/web/20140715043402im_/http://images.gizmag.com/related/default_related.png" alt="World first 'super twisted' light boosts disease identification"/> </a> <a class="rel_title" href="/web/20140715043402/http://www.gizmag.com/super-twisted-light-disease-identification-world-first/16856/">World first 'super twisted' light boosts disease identification</a> <p class="rel_date">8th November, 2010</p> </li> </ul> <div class="clear_both"></div> </div>  <div id="search_form_bottom"> <form action="https://web.archive.org/web/20140715043402/http://www.gizmag.com/search/" id="cse-search-box-bottom"> <span class="title">Looking for something? Search our 27,651 articles</span> <div class="dotsontop"> <input type="hidden" name="cx" value="partner-pub-1607124478120364:bqw4wo-1udf"/> <input type="hidden" name="cof" value="FORID:11"/> <input type="hidden" name="ie" value="ISO-8859-1"/> <input type="text" name="q" size="60" id="search_input"/> <input type="submit" name="sa" value="Search"/> </div> </form> <script type="text/javascript" src="https://web.archive.org/web/20140715043402js_/http://www.google.com/cse/brand?form=cse-search-box-bottom&lang=en"></script> </div> <div data-cb-ad-id="Content Well 3"> </div> </div> <div id="right_cols"> <div class="island" id="island_top_right" data-cb-ad-id="Top Island"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display("island_top_right"); }); </script> </div> <div id="right_col_a"> <div id="right_col_b"> <div class="ad" id="skyscraper_right" data-cb-ad-id="Skyscraper"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display("skyscraper_right"); }); </script> </div> <div class="ad"> <span class="title">Sections</span> <ul class="dots" id="sections_list"> <li><a href="/web/20140715043402/http://www.gizmag.com/features/" class="features_reviews_list">Features</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/reviews/" class="features_reviews_list">Reviews</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/aircraft/">Aircraft</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/architecture/">Architecture</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/aroundthehome/">Around The Home</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/automotive/">Automotive</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/bicycles/">Bicycles</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/children/">Children</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/computers/">Computers</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/digital-cameras/">Digital Cameras</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/electronics/">Electronics</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/environment/">Environment</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/games/">Games</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/goodthinking/">Good Thinking</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/health/">Health and Wellbeing</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/destinations/">Holiday Destinations</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/homeentertainment/">Home Entertainment</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/remarkablepeople/">Inventors and Remarkable People</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/laptops/">Laptops</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/marine/">Marine</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/medical/">Medical</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/military/">Military</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/mobiletechnology/">Mobile Technology</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/motorcycles/">Motorcycles</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/music/">Music</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/outdoors/">Outdoors</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/pets/">Pets</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/robotics/">Robotics</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/science/">Science</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/space/">Space</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/sports/">Sports</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/telecommunications/">Telecommunications</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/urbantransport/">Urban Transport</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/wearableelectronics/">Wearable Electronics</a></li> </ul> </div> </div>  <span class="title">Recent popular articles in Science</span> <ul id="recent_popular" class="vertical_sprite recent_popular_38"> <li id="story0"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/polymer-graphene-substitute-kist/32824/" title="Polymer-based graphene substitute is easy to mass-produce"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/polymer-graphene-substitute-kist/32824/">Polymer-based graphene substitute is easy to mass-produce</a> </div> </li> <li id="story1"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/gradient-structure-increase-metal-toughness/32819/" title="Bamboo inspires new process for making metals tougher"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/gradient-structure-increase-metal-toughness/32819/">Bamboo inspires new process for making metals tougher</a> </div> </li> <li id="story2"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/invisibility-cloak-touch/32712/" title="New "invisibility cloak" keeps objects from being felt"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/invisibility-cloak-touch/32712/">New "invisibility cloak" keeps objects from being felt</a> </div> </li> <li id="story3"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/squid-sucker-teeth/32817/" title="Squid sucker teeth could advance human technology"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/squid-sucker-teeth/32817/">Squid sucker teeth could advance human technology</a> </div> </li> <li id="story4"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/burton-true-3d-laser-plasma-display/20499/" title="Burton rolls out True 3D laser plasma display"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/burton-true-3d-laser-plasma-display/20499/">Burton rolls out True 3D laser plasma display</a> </div> </li> <li id="story5"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/borospherene-boron-buckyball/32939/" title="Borospherene bounces into buckyball family"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/borospherene-boron-buckyball/32939/">Borospherene bounces into buckyball family</a> </div> </li> <li id="story6"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/power-pallet-20-gasifier-biomass-generator/32245/" title="Could this little-known biomass generator start an energy revolution?"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/power-pallet-20-gasifier-biomass-generator/32245/">Could this little-known biomass generator start an energy revolution?</a> </div> </li> <li id="story7"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/3d-printed-strong-composite/32738/" title="3D-printed composite is lighter than wood and stiffer than concrete"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/3d-printed-strong-composite/32738/">3D-printed composite is lighter than wood and stiffer than concrete</a> </div> </li> <li id="story8"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/artist-grows-living-copy-vincent-van-goghs-ear/32925/" title="Artist creates a living copy of Vincent Van Gogh's ear with relative's DNA"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/artist-grows-living-copy-vincent-van-goghs-ear/32925/">Artist creates a living copy of Vincent Van Gogh's ear with relative's DNA</a> </div> </li> <li id="story9"> <a class="vs_img" href="/web/20140715043402/http://www.gizmag.com/llnl-ultralight-metamaterial/32589/" title="New materials developed that are as light as aerogel, yet 10,000 times stronger"></a> <div class="vs_title"> <a href="/web/20140715043402/http://www.gizmag.com/llnl-ultralight-metamaterial/32589/">New materials developed that are as light as aerogel, yet 10,000 times stronger</a> </div> </li> </ul> <div class="clear_both"></div> <div class="island" id="island_bottom_right" data-cb-ad-id="Bottom Island"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display("island_bottom_right"); }); </script> </div> <iframe src="/web/20140715043402if_/http://www.gizmag.com/inc/gizmag-store.html" id="store" scrolling="no"></iframe> <div id="article_follower" data-cb-ad-id="Article Follower"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display("article_follower"); }); </script> </div>   </div>  </div> <div class="clear_left"></div>  </div>  <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/footer_tabs.js?1404869523"></script> <div id="footer_outer"> <div id="footer">  <div class="footer_item" id="footer_popular"> <span class="footer_title">Most Popular Articles</span>  <div class="tabbable"> <ul class="nav nav-tabs" id="most_popular_tabs"> <li class="active"><a data-target="#popular_today" data-toggle="tab" data-period="day">Today</a></li> <li><a data-target="#popular_week" data-toggle="tab" data-period="week">Last week</a></li> <li><a data-target="#popular_all" data-toggle="tab" data-period="all">All time</a></li> </ul> <div class="tab-content"> <div class="tab-pane active" id="popular_today"> <ul class="popular_articles"> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/firefly-alpha-aerospike-launch-vehicle/32892/">Firefly Space Systems unveils Alpha launch vehicle design with aerospike engine</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/boeing-space-bins-carry-on-luggage/32934/">Boeing increases carry-on capacity with new Space Bins</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/borospherene-boron-buckyball/32939/">Borospherene bounces into buckyball family</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/dol-fin-dolphin-fluke-hydrofoil/32926/">DOL-Fin is designed to let you swim like a dolphin</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/titanium-utility-ring/26025/">The Titanium Utility Ring makes your fingers extra-useful – and manly</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/nuseti-inner-drive-system-mountain-bike/32914/">Nuseti mountain bike features a sealed drivetrain</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/jaguar-land-rover-virtual-windscreen-concept/32930/">Jaguar Virtual Windscreen concept looks to the future of HUDs</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/xpcamper-cube-truck-camper/32818/">Adventure cubed: XPCamper carries your favorite gear around the world</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/pierre-deroche-tnt-royal-retro/32881/">Pierre DeRoche TNT Royal Rétro 43 shows that six second hands are better than one</a></li> <li><a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/fingerreader-blind-read-written-text/32936/">FingerReader helps visually impaired read in real-time</a></li> </ul> </div> <div class="tab-pane" id="popular_week"> <ul class="popular_articles"> </ul> </div> <div class="tab-pane" id="popular_all"> <ul class="popular_articles"> </ul> </div> </div> </div> </div>  <div class="footer_item" id="footer_commented"> <span class="footer_title">Most Commented Articles</span>  <div class="tabbable"> <ul class="nav nav-tabs" id="most_commented_tabs"> <li class="active"><a data-target="#commented_today" data-toggle="tab" id="commented_today_tab" data-period="day">Today</a></li> <li><a data-target="#commented_week" data-toggle="tab" id="commented_week_tab" data-period="week">Last week</a></li> <li><a data-target="#commented_all" data-toggle="tab" id="commented_all_tab" data-period="all">All time</a></li> </ul> <div class="tab-content"> <div class="tab-pane active" id="commented_today"> <ul class="commented_articles"> </ul> </div> <div class="tab-pane" id="commented_week"> <ul class="commented_articles"> <li><a href="/web/20140715043402/http://www.gizmag.com/ucr-nox-out-catalytic-reduction-lawnmower-emissions/32872/">Student-designed device reduces gas lawnmower air pollution by over 90 percent</a> (23)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/ecodrain-drain-heat-exchanger/32858/">EcoDrain recycles the heat in used hot shower water</a> (20)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/radical-helicopter-design-has-dual-tilting-blades-and-can-travel-at-over-270mph/32840/">Radical dual tilting blade helicopter design targets speeds of over 270mph</a> (19)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/net-zero-energy-home-surplus/32906/">Net-zero energy test home ends year-long study with surplus energy</a> (19)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/f-35b-debut-cancelled/32894/"> F-35 Lightning II international debut cancelled</a> (18)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/volvo-claims-that-new-xc90-will-be-the-worlds-cleanest-and-most-powerful-suv/32887/">Volvo claims that new XC90 will be "the world's cleanest and most powerful SUV"</a> (14)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/mcor-iris-paper-3d-printer/32903/">Layered paper 3D printers: Full color, durable objects at a fraction of the cost</a> (13)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/firefly-alpha-aerospike-launch-vehicle/32892/">Firefly Space Systems unveils Alpha launch vehicle design with aerospike engine</a> (13)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/protein-for-fat-cheese-cakes/32916/">Proteins could take the place of fats in diet cheeses and cakes</a> (11)</li> <li><a href="/web/20140715043402/http://www.gizmag.com/bmw-induction-charging/32863/">BMW developing wireless inductive charging system for electric vehicles</a> (9)</li> </ul> </div> <div class="tab-pane" id="commented_all"> <ul class="commented_articles"> </ul> </div> </div> </div> </div>  <div class="footer_item nomargin" style="margin: 0px;" id="footer_subscribe"> <div> <form id="footer_email_form" class="form-inline" action="/web/20140715043402/http://www.gizmag.com/index.php"> <span class="small">Subscribe to Gizmag's</span><br/> <span class="large">Email Newsletter</span> <input type="text" name="email" class="email" value="Enter Your Email Address ..." onclick="this.value=''; this.style.color='#999'" id="footer_email"/> <button type="submit" class="bootbtn" id="footer_subscribe_button">Subscribe</button> </form> <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/subscribe_footer.js?1404869523"></script> <div class="subscribe_options"> <a target="_blank" href="https://web.archive.org/web/20140715043402/http://twitter.com/gizmag/" class="twitter_footer greytitle"> <span class="small">Follow Gizmag on</span> <span class="large">Twitter</span></a> </div> <div class="subscribe_options"> <a target="_blank" href="https://web.archive.org/web/20140715043402/http://www.youtube.com/user/gizmag" class="youtube_footer greytitle"> <span class="small">Subscribe to Gizmag's</span> <span class="large">YouTube channel</span></a> </div> <div class="subscribe_options"> <a href="https://web.archive.org/web/20140715043402/http://www.gizmag.com/xml/" class="rss_footer greytitle"> <span class="small">Subscribe to Gizmag's </span> <span class="large">RSS feed</span></a> </div> <div class="subscribe_options"> <a href="https://web.archive.org/web/20140715043402/http://www.stumbleupon.com/channel/Gizmag/" class="su_footer greytitle"> <span class="small">Follow Gizmag on </span> <span class="large">Stumbleupon</span></a> </div> <div class="subscribe_options"> <a href="https://web.archive.org/web/20140715043402/https://plus.google.com/105149739082983197804" class="gplus_footer greytitle"> <span class="small">Follow Gizmag on </span> <span class="large">Google Plus</span></a> </div> </div> </div> <div class="clear_both"></div> </div> <div id="copyright"><em>All content copyright © Gizmag 2003 - 2014</em></div> <div class="clear_left"></div> </div> <div class="index" id="footer_index"> <div class="index_center bottom_strip"> <ul> <li><a href="#top">Top</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/">Home</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/about/">About</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/contact/">Contact</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/privacy/">Privacy</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/termsofuse/">Terms & Conditions</a></li> <li><a href="/web/20140715043402/http://www.gizmag.com/advertise/" class="brighter">Advertise</a></li> </ul> </div> </div> <link rel="stylesheet" type="text/css" href="/web/20140715043402cs_/http://www.gizmag.com/inc/jqmodal/jqModal.css"/> <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/jqmodal/jqModal.js"></script> <div id="subscribe_overlay_container" class="jqmWindowModSize"></div> <script type="text/javascript" src="/web/20140715043402js_/http://www.gizmag.com/inc/subscribe_overlay.js?x=1405398842"></script>  <script src="https://web.archive.org/web/20140715043402js_/http://static.getclicky.com/js" type="text/javascript"></script> <script type="text/javascript">clicky.init(110681);</script> <noscript><p><img alt="Clicky" width="1" height="1" src="https://web.archive.org/web/20140715043402im_/http://in.getclicky.com/110681ns.gif"/></p></noscript>  <script type="text/javascript"> var _sf_async_config={uid:4159,domain:"gizmag.com"}; _sf_async_config.authors = "Ben Coxworth"; _sf_async_config.sections = "Science"; (function(){ function loadChartbeat() { window._sf_endpt=(new Date()).getTime(); var e = document.createElement('script'); e.setAttribute('language', 'javascript'); e.setAttribute('type', 'text/javascript'); e.setAttribute('src', '//web.archive.org/web/20140715043402/http://static.chartbeat.com/js/chartbeat_pub.js'); document.body.appendChild(e); } var oldonload = window.onload; window.onload = (typeof window.onload != 'function') ? loadChartbeat : function() { oldonload(); loadChartbeat(); }; })(); </script>  <script type="text/javascript" src="https://web.archive.org/web/20140715043402js_/http://s3.amazonaws.com/new.cetrk.com/pages/scripts/0008/8786.js"> </script>   <div id="bottom_include"> <script type="text/javascript">googletag.cmd.push(function() { googletag.display("bottom_include"); });</script> </div>        </body> </html>

CINXE.COM

Gold – soon to be available in colors other than gold