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<p>[QUOTE=&quot;joecoincollect, post: 2523701, member: 71338&quot;]ive run into this problem a few times. When i saw the tape on the coins, blue goo was underneath the tape and on the coins. This was indicative of PVC exposure. If they were in contact with tape for many years, id imagine they are damaged by PVC. If you roll a q tip soaked in acetone across the coin and it turns bright blue, there&#039;s your pvc. Ive saved some coins from PVC but other times the blue grime could not be removed without also taking off some of the metal. I think with ancients it is necessary to remove active corrosion so the rot doesn&#039;t spread (bronze disease?) but ive also seen ancients with a nice blue patina that is left intact. I&#039;m a little confused i guess. Maybe the tone of the blue tells you what you&#039;re dealing with[/QUOTE]</p><p><br /></p>

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