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<p>[QUOTE=&quot;desertgem, post: 870692, member: 15199&quot;]That will come as a shock to those who find ancient coins with verdigris that never have seen time in a PVC holder or environment. PVC under normal conditions ( STP) is a hard chemical resistant plastic that typically would do no harm to&nbsp; coins. BUT when acidic plasticizers ( as much as 35%) are added to PVC to make it clearer and flexible, these can migrate from plasticized PVC flips and the acidic components in the present of moisture can begin the verdigris process. </p><p><br /></p><p>PVC is not verdigris.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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