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<p>[QUOTE=&quot;SuperDave, post: 2462120, member: 1892&quot;]Acetone is an organic solvent, and that yellow is likely glue or tape residue on this coin, or perhaps something else from the storage environment. I&#039;m not seeing it as either &quot;green&quot; or a PVC infestation - fifteen years of PVC working on your coin should have likely pitted it by now. Acetone will remove it without problem, but if the coin acquired any further patina while the glue/tape was in place, the &quot;yellow&quot; removal will result in &quot;clean&quot; patches on the coin clearly indicating it was treated and unoriginal. If I&#039;m wrong and it_is PVC, the acetone is still called for anyway and you should expect a full recovery. Note the radically-different color in C-B-D&#039;s case.</p><p><br /></p><p>Your Mint State coins are almost certainly not the same problem; what you see as &quot;yellow&quot; might just be early-stage toning, which acetone won&#039;t touch. Again, if I&#039;m wrong on the color - can&#039;t say I&#039;ve ever seen PVC manifest in yellow - acetone will take care of them too.[/QUOTE]</p><p><br /></p>

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