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<p>[QUOTE=&quot;Mad.Outcast, post: 870671, member: 24625&quot;]Ok,PVC releases chloride,it is chloride that reacts to the copper to create verdigris.It takes chloride and its chemical reaction to create verdigris.PVC starts as a clear liquid,as it reacts to the copper in a cent it turns green.essentially without PVC verdigris&nbsp; does not exist.Silver contains little to no copper so it does not turn into verdigris.unless copper is present.</p><p><br /></p><p>So PVC=verdigris on copper.</p><p><br /></p><p>Some copper was stored in PVC at one time,and chloride from the PVC was released onto the coin.later the coin was put into an album,it still reacted to the copper and became a dry verdigris.</p><p><br /></p><p>there are two types of verdigris dry &amp; wet.</p><p><br /></p><p>the chloride will come off with acetone,or most of it,because it has not &quot;bonded&quot; to the coin.but the 2nd stage of the PVC damage verdigris&nbsp; is chemically bonded tighter than acetone,that is why it will not come off.[/QUOTE]</p><p><br /></p>

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