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<p>[QUOTE=&quot;GDJMSP, post: 64390, member: 112&quot;]Howdy Willie - Welcome to the Forum !!</p><p><br /></p><p>Verdigris is normally only found on copper coins. But there are instances where it has been found on silver and even some gold. This is because of the copper alloy used in the coins. But this is not common. If you have green stuff on a silver coin I would be more likely to suspect that it is PVC residue than I would verdigris. But both substances should <u>always</u> be removed as they will only damage the coin further if left alone.</p><p><br /></p><p>As for staining - that depends. If the stain is a substance that may harm the coin or result in corrosion - then yes I would recommend it be removed. Otherwise I would leave it alone.</p><p><br /></p><p>When trying to clean a harmful substance like PVC from a coin just treat the coin as you would any other like it. If the coin is circulated, I see no harm in using your fingers unless it is a particularly rare or valuable coin. With Unc or valuable coins I would recommend using a pair of coin tongs. You can find them at most coin supply shops.[/QUOTE]</p><p><br /></p>

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