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<p>[QUOTE=&quot;rbf, post: 99602, member: 3588&quot;]A while ago I broke up some modern proof sets and put the coins in 2x2 plastic flips.&nbsp; I forgot about those coins for a couple of years, but just recently I found them and was shocked and disappointed to see that some of them acquired a greenish residue!&nbsp; Both the clad proofs as well as the silver proofs turned this way.&nbsp; But interestingly, not ALL of them turned green, even though all of the holders were identical.&nbsp; I&#039;m curious as to why that is.&nbsp; More importantly, though, I need to know how to get the green stuff off easilly without hurting the coins.&nbsp; Otherwise they&#039;re pretty much worthless to me, because they look horrible.[/QUOTE]</p><p><br /></p>

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