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<p>[QUOTE=&quot;desertgem, post: 785785, member: 15199&quot;]Plasticizers in flexible PVC (esters of phthalic acid) can migrate from the plastic to surrounding objects ( coins) and with humidity from the atmosphere&nbsp; form an acid that can start to react on the coin. With copper coins, it usually forms a greenish mucus appearing specks that can eventually react with enough copper and other atmospheric chemicals such as sulfides, chlorides, oxygen , etc, which forms a &quot;permanent&quot; verdigris. In the early stages, acetone can remove the &quot;pvc plasticizers&quot;, once other chemicals come into play, it can&#039;t remove verdigris.</p><p><br /></p><p>Silver coins, and even some copper can start with a haze on the surface which then can progress from there. Most noticeable on proof finish coins in early stages. On high percentage silver coins, the color is usually not as green, but more gray/violet mucus appearing. </p><p><br /></p><p>My son once said it looked like a bug &quot;pooped&quot; green droplets on the coin</p><p><br /></p><p>Unfortunately the damage can start invisibly for some time until the metal affected can be seen.</p><p><br /></p><p>I hope I don&#039;t have any PVC plasticizer damaged coins <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> but if I find one, I will photo it. <b>IMO, and I know some disagree with me,</b> so think, but I rinse every coin that comes to me from unknown places or people with acetone before putting it into a mylar flip. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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