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<p>[QUOTE=&quot;Gallienus, post: 4300682, member: 42034&quot;]PVC= Poly Vinyl Chloride.&nbsp; It&#039;s a soft plastic which often comes transparent and was used for old 2x2 coin flips.&nbsp; Also it was used for making &quot;coin pages&quot;.&nbsp; The plastic polymer chain contains Chlorine atoms (Cl) and when the plastic decomposes the Chlorine is released.&nbsp; This is extremely reactive against copper and silver coins forming discoloration before eating away at the metal turning it to a &quot;salt&quot;.</p><p><br /></p><p>To remove PVC residue, the coin should be rinsed with acetone and perhaps sent in to be professionally conserved.[/QUOTE]</p><p><br /></p>

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