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<p>[QUOTE=&quot;GDJMSP, post: 25849014, member: 112&quot;]It&#039;s certainly possible that some of it was PVC residue, it&#039;s definitely not unheard of for both to be on the same coin.</p><p><br /></p><p>That said, when verdigris forms and for sometime after it is a powdery substance. It doesn&#039;t get hard and crusty until after an extended period of time, typically years. But when it is still powdery any contact with virtually anything from plain water or any other liquid, or even your finger will brush it away. But the hard stuff, doesn&#039;t work like that. It is the hard, crusty verdigris that Verdi-Care safely removes.</p><p><br /></p><p>Verdigris, other than the color, is very much like rust on iron or steel. If you&#039;ve ever handled anything rusty, when you take your hands away they are going to have rust on them. You can even take a rusty object and rinse it in water then dry with a cloth and the rust on the object will be gone. And what isn&#039;t washed away by the water will be on the cloth. The effects of the corrosion that produced the rust will still be there on the object, but the rust will be gone. Verdigris behaves in the same manner while it&#039;s still powdery.[/QUOTE]</p><p><br /></p>

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