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<p>[QUOTE=&quot;kanga, post: 875816, member: 9270&quot;]It&#039;s most likely verdigris.</p><p>The copper in the cent has combined with some other compound in the environment.</p><p>That means the coin&#039;s surface has already been compromised.</p><p>The damage is done.</p><p>Go ahead and clean it but not by rubbing it with something.</p><p>You need some sort of dip.</p><p>Someone should be along with more specific info.[/QUOTE]</p><p><br /></p>

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