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<p>[QUOTE=&quot;GDJMSP, post: 24571761, member: 112&quot;]PVC residue, when it&#039;s first deposited, and for a while after, on coins is crystal clear and usually cannot even be seen. It is only after it has been there for some time that it begins changing color, and it can change to several different colors. It can change from clear to various shades of green, tan, brown, and black. And as it dries out it can be any of those colors. And once it does dry out it becomes flakey and crumbly and is no longer filmy, slimy, or gooey at all.</p><p><br /></p><p><br /></p><p><br /></p><p>Yes it can. But I strongly recommend that acetone never be used on copper coins as it can sometimes cause them to turn weird colors. With copper coins use xylene instead as it removes PVC residue just as readily and easily, evaporates just as quickly, and does not sometimes cause the weird colors on the coins.</p><p><br /></p><p>I also recommend that once the xylene rinse is completed that each coin be rinsed in clean distilled water and allowed to air dry overnight with the coin standing on edge on a soft towel while leaning against a countertop backsplash or something.[/QUOTE]</p><p><br /></p>

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