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<p>[QUOTE=&quot;desertgem, post: 1501692, member: 15199&quot;]<a href="http://www.metacafe.com/watch/1262456/make_a_gold_penny/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.metacafe.com/watch/1262456/make_a_gold_penny/" rel="nofollow">http://www.metacafe.com/watch/1262456/make_a_gold_penny/</a></p><p><br /></p><p><a href="http://www.youtube.com/watch?v=_g_ml8tAnWE" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.youtube.com/watch?v=_g_ml8tAnWE" rel="nofollow">http://www.youtube.com/watch?v=_g_ml8tAnWE</a></p><p><a href="http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/" rel="nofollow"><br /></a></p><p><a href="http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/" rel="nofollow"><br /></a></p><p><a href="http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/" rel="nofollow">http://science.wonderhowto.com/how-to/turn-penny-into-gold-with-common-chemicals-272618/</a></p><p><br /></p><p><a href="http://www.instructables.com/id/Make-Gold-And-Silver-Pennies/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.instructables.com/id/Make-Gold-And-Silver-Pennies/" rel="nofollow">http://www.instructables.com/id/Make-Gold-And-Silver-Pennies/</a></p><p><br /></p><p><br /></p><p>This is a common experiment in middle and beginning high school chemistry classes. It is in 3 different mass produced lab manuals. I am not saying this is what happens to yours,</p><p><br /></p><p>But the probability is higher than any other reason.</p><p>&nbsp;</p><p>The layer conforms closely to the coins surface if&nbsp; recent BU, and will vary due to the quantity of reactants, so as in the top example, some of the copper tends to show through.</p><p><br /></p><p>Several have noted on their own utubes of their experiment that they have sold them to their friends for $10-30.</p><p><br /></p><p>You might want to make some yourself for comparison before spending money on TPG grading. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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