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<p>[QUOTE=&quot;desertgem, post: 425791, member: 15199&quot;]First, are you sure it is PVC rather than nickle corrosion like verdigris on copper coins. Nickle can make similar colored compounds ( some of my artist&#039;s oils use nickle compounds for a bluish green color. You can tell by putting the coin in pure acetone. PVC &quot;gunk&quot; will dissolve, the corrosion will not. I put every coin I obtain through an acetone bath before I put it into a permanent holder. Unfortunately , I only started this after several of my earlier obtained coins developed finderprints after 10-20 years.If I had done this, some of my Lincoln proofs would be pristine <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /></p><p><br /></p><p>&nbsp;&nbsp;&nbsp; Air-Tites are not air tight!&nbsp; They are not much or any more airtight than a coin in a tightly stapled mylar lined 2X2. They are nice holders, they physically protect the coin well, but 10 years is plenty of time for environmental corrosion to start. Often Ait-Tites users get overconfident as do slab owners about the safety from the environment. </p><p><br /></p><p>I am hoping it is something easily dissolved in acetone. Good Luck.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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