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<p>[QUOTE=&quot;paddyman98, post: 4560773, member: 44615&quot;]Classroom science lab experiments. They chemically plated Copper Cents with other metals such as Mercury. We have seen dozens of examples over the years here on CoinTalk and it&#039;s a know procedure among coin collectors. Goes back decades.[/QUOTE]</p><p><br /></p>

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