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<p>[QUOTE=&quot;robinjojo, post: 4465954, member: 110226&quot;]I don&#039;t see any indications of a copper core, such as places where silver plating has fallen off.&nbsp; I would tend to agree that debased silver, with it high copper content, is likely the source of the blue powder, which is copper oxidation and not PVC damage.&nbsp; </p><p><br /></p><p>PVC damage tends to be dark green and kind of gooey, although it can harden over time.&nbsp; A bath in pure acetone will remove it, but depending on the degree of deposit the process might take some time and more than on bath.</p><p><br /></p><p>Be careful using acetone: it is very flammable and it should only be used in a well ventilated area.&nbsp; Avoid breathing in the fumes.&nbsp; Allow the coin to dry and stabilize for several days before putting it in a PVC-free flip or paper envelope.[/QUOTE]</p><p><br /></p>

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