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<p>[QUOTE="robinjojo, post: 5455028, member: 110226"]I see the problem. If it is PVC damage, try soaking the coin in a 100% acetone bath. The acetone will not damage the coin, and it will dissolve any PVC gunk on the coin. If the PVC spots are hard, you might need to let the coin soak for several minutes, until they disappear. Then, rise the coin with some distilled water.</p><p><br /></p><p>If the green spots are due to oxidation of the copper used in the alloy, the acetone will not remove them. But, judging from what you said about the earlier storage of the heller, I imagine you have some PVC deposits that need removal.</p><p><br /></p><p>Make sure you use 100% acetone and not nail polish remover, which is a lower concentration and often perfumed with some cloying scent.</p><p><br /></p><p>Also, remember that 100% acetone is extremely flammable and avoid the fumes - use it in an open space and way from any flames or source of ignition.</p><p><br /></p><p>If, upon re-examination, some spots are still present, you will need to repeat the process. Some old PVC deposits can be stubborn, but with persistence you should be able to remove them.[/QUOTE]</p><p><br /></p>
[QUOTE="robinjojo, post: 5455028, member: 110226"]I see the problem. If it is PVC damage, try soaking the coin in a 100% acetone bath. The acetone will not damage the coin, and it will dissolve any PVC gunk on the coin. If the PVC spots are hard, you might need to let the coin soak for several minutes, until they disappear. Then, rise the coin with some distilled water. If the green spots are due to oxidation of the copper used in the alloy, the acetone will not remove them. But, judging from what you said about the earlier storage of the heller, I imagine you have some PVC deposits that need removal. Make sure you use 100% acetone and not nail polish remover, which is a lower concentration and often perfumed with some cloying scent. Also, remember that 100% acetone is extremely flammable and avoid the fumes - use it in an open space and way from any flames or source of ignition. If, upon re-examination, some spots are still present, you will need to repeat the process. Some old PVC deposits can be stubborn, but with persistence you should be able to remove them.[/QUOTE]
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