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<p>[QUOTE=&quot;GDJMSP, post: 1771317, member: 112&quot;]PVC residue is not always gooey, nor is it always green. It comes in many different colors ranging from almost clear, to whitish, to greenish, to brownish. And it can be oily, gooey, dried out, and even flaky. But acetone will remove any and all of it.</p><p>&nbsp;</p><p>Verdigris on the other hand is often crusty &amp; powdery looking if looked at closely with a loupe. And acetone will not remove verdigris. VerdiCare will remove it, to a limited degree, depending on how severe the verdigris is. And verdigris is contagious, if one coin with verdigris comes into contact with another coin, the other can and often will develop verdigris itself.</p><p>&nbsp;</p><p>But verdigris can seemingly appear right of thin air if conditions are right. One of those conditions is moisture, and that doesn&#039;t necessarily mean liquid water. The humidity in the air is enough to cause verdigris to develop. That is why proper storage is so important. And verdigris, while most commonly found on copper coins, is also found on silver coins and even on gold coins. So don&#039;t think that copper coins are the only thing you have to worry about.[/QUOTE]</p><p><br /></p>

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