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<p>[QUOTE=&quot;rockdude, post: 1516057, member: 15378&quot;]The golden dollar coins, including the Sacagawea Dollar and the Presidential Dollars are&nbsp; clad. They have a copper core with clad layers made from a zinc, manganese, and nickel combination. </p><p><br /></p><p>This is probably what happened to your coin.&nbsp; (see site below)</p><p><br /></p><p><a href="http://science.wonderhowto.com/how-to/turn-pennies-into-silver-and-gold-coins-with-zinc-367856/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://science.wonderhowto.com/how-to/turn-pennies-into-silver-and-gold-coins-with-zinc-367856/" rel="nofollow">http://science.wonderhowto.com/how-to/turn-pennies-into-silver-and-gold-coins-with-zinc-367856/</a>[/QUOTE]</p><p><br /></p>

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