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<p>[QUOTE=&quot;BadThad, post: 1285234, member: 17261&quot;]PVC is a catylist for verdigris formation created by hydrochloric acid forming cupric chloride. PVC damage and verdigris are essentially one in the same.</p><p><br /></p><p>On this coin, you&#039;re seeing verdigris which could have been caused by PVC or the environment. The first step is to soak it for about a hour in acetone. At the end of the soak and while the coin is still under fluid, I would prod at the spot with a toothpick to see if it comes apart. Acetone will NOT remove verdigris, but if there&#039;s PVC holding it together it will (mostly) come off.[/QUOTE]</p><p><br /></p>

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