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<p>[QUOTE=&quot;desertgem, post: 1824364, member: 15199&quot;]Welcome to the forum Boston 38.&nbsp;&nbsp; This is most likely from a chem lab experiment commonly done in high schools or beginning college chem.</p><p><br /></p><p><a href="http://chemistry.about.com/od/chemistryhowtoguide/a/goldsilverpenny.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://chemistry.about.com/od/chemistryhowtoguide/a/goldsilverpenny.htm" rel="nofollow">http://chemistry.about.com/od/chemistryhowtoguide/a/goldsilverpenny.htm</a></p><p><br /></p><p>It is first done by depositing a layer of zinc on the copper of the cent, The zinc , since it is pure produces a silver colored surface if done correctly.&nbsp; Then if sufficient heat is applied, the plated on zinc fuses with the underlying copper to produce bright brass , which then supposedly looks like gold penny. My classes put about 100 a year in circulation. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />&nbsp; Jim[/QUOTE]</p><p><br /></p>

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