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<p>[QUOTE=&quot;drmarosen, post: 871634, member: 6011&quot;]This is my first visit to this forum.</p><p>Read all posts up to this one...............this is the only valid info on polyvinyl chloride.</p><p>In fact the &quot;vinyl groups&quot; you mention is actually &quot;monomeric vinyl chloride&quot;. And possibly, yes, the green could be the result of the copper reacting with the chlorine (chloride ions from vinyl chloride molecules IN THEORY!)........I guess?? But, the owner mentioned coins were kept in book (like old or new Whitman Album) and may actually be plain old exposure to moisture in air, and any chloride AND/OR sulfate/sulfide ions that the water vapor (present in the ambient air) contains. The PVC bit sounds a bit far fetched..........I majored in chem. as an undergrad. The &quot;sweating PVC thing&quot; may be real........but its news to me.</p><p>The owner better be damn careful dealing with the corrosion/verdegris..........depending on what ever else the copper has reacted with. Since the book/album is not hermetically sealed (none are), the green could be cupric chloride, cupric sulfide, cupric sulfate and possibly more, depending upon what is disolved in the water vapor content of the ambient air. Acetone will disolve certain polymerized materials, but I&#039;m not sure about PVC...........but as I write this reply, and engage my brain.......who cares because that isn&#039;t PVC..........&quot;NFW&quot;. Forget the acetone unless it surrendipitously will repair corrosive change. I have dipped bronze items (civil war artifacts) into light oil and wrap in parchament paper (to prevent oil absorbtion/evaporation) AFTER corrosion is first REMOVED (good luck) to completely seal from air for an extended period to prevent further corrosion.&nbsp; </p><p>Use real care in dealing with this and keep any and all coins/coinholders is a controlled enviornment............free of excessively moist air. Sheds and unfinished basements,&nbsp; are to be avoided, along with storage in non-airconditioned homes or buildings.</p><p>Regards,</p><p>Mike Rosen, M.D.[/QUOTE]</p><p><br /></p>

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