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<p>[QUOTE=&quot;desertgem, post: 425816, member: 15199&quot;]It could have been so small a focal area that it wasn&#039;t noticed and then as moisture and air entered the holder over the 10 years, the spot could have absorbed the moisture and increased its size. The way I understand the process ( and I will stand corrected if someone else has more authoratative&nbsp; info) is that plasticizers come out of the pvc flip or holder ( some plastic album sleeves had it also 20 yrs ago) and attach to the surface of the coin. On proofs which have smaller metal flow lines than business, the first sign is usually a haze which can damage the mirror like surface of proofs. On the coarser flow lined business strike, it can form thicker deposits and poduces the green gunk after it has absorbed enough moisture to react with the metal, the green actually shows the metal is being affected. Even taking it off with acetone can leave pits visible to TPG and sharp collectors if it has been active long enough.</p><p><br /></p><p>The best thing is for collectors to take the time to look carefully at their collection every few years for problems. I didn&#039;t, and learned a lesson. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /></p><p>Very happy it came off, and I doubt there was much if any visible damage.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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