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<p>[QUOTE=&quot;GDJMSP, post: 1820215, member: 112&quot;]Because the acid in it is reacting with the copper. When PVC residue is first deposited on a coin it is a clear, oily like substance. But in time it turns green due to that reaction. But at that point it isn&#039;t verdigris yet, it is still oily, slimy. </p><p><br /></p><p>Later after it dries, yeah I agree it can turn into verdigris, but it doesn&#039;t always do so. PVC residue can dry clear, or green, or tan, or even dark brown. Verdigris on the other hand is always green.[/QUOTE]</p><p><br /></p>

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