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<p>[QUOTE=&quot;GDJMSP, post: 24890758, member: 112&quot;]No, it commonly forms on silver and gold as well. All it takes are minute traces of copper, whether it was intended to be in the alloy or not.</p><p><br /></p><p>That said, not all things green on a coin are verdigris either. Natural and artificial toning, as well as PVC residue (which can be many different colors) can be green as well.[/QUOTE]</p><p><br /></p>

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