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<p>[QUOTE=&quot;Bob Evancho, post: 6379804, member: 84595&quot;]In the early 1970&#039;s, the ANA graded coins and placed them in PVC flips and heat sealed them.&nbsp; On one side was the coin and on the other side was a small certificate.&nbsp; Both sides were heat sealed.&nbsp; As I have posted in other threads, I took the coin ( Proof 1937 Australian Crown) from the bank and immediately removed it from the PVC flip.&nbsp; It had PVC oil on the coin.&nbsp; I followed instructions to place the coin gently in a beaker and pour acetone on it and then gently swish the acetone around without moving the coin.&nbsp; I then removed the coin from the acetone and let it air dry.&nbsp; I was instructed to do this 5 times which I did.&nbsp; Under a microscope, I could see where the PVC oil had microscopically discolored and etched the sterling silver.&nbsp; So if you have any older ANA graded coins, remove them from the PVC flip to prevent any further damage.&nbsp; This coin now resides in a SEGS holder to be preserved without further PVC damage.&nbsp; [ATTACH=full]1252594[/ATTACH] [ATTACH=full]1252595[/ATTACH][/QUOTE]</p><p><br /></p>

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