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<p>[QUOTE=&quot;Curious Coin, post: 3170343, member: 97554&quot;]The way is was explained to me is that it was an electrochemical process. The gentleman would take copper plated zinc alloy pennies and dissolve the zinc alloy leaving only a thin foil like copper plating. He would then dissolve the copper plating into another solution which he would strain and add to yet another solution which he would submerge a coin into. He would then place &quot;probes&quot; into the final solution causing the suspended copper particles to bond to the coin.[/QUOTE]</p><p><br /></p>

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