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<p>[QUOTE="robinjojo, post: 6541533, member: 110226"]You should buy some pure acetone. The diluted acetone is not very effective, as you noted. The 100% acetone makes a world of difference.</p><p><br /></p><p>Now you mentioned that soaking the coin had no effect on the obverse. Judging from the photos the obverse might have deposits of oxides and not PVC deposits. Acetone has no effect on oxides.</p><p><br /></p><p>I just opened the image in Photoshop and enlarged it. It really does look like oxide buildup. </p><p><br /></p><p>So, I would suggest that you try soaking the coin in 100% acetone. The acetone will not affect the metal. If the deposit persists, try soaking the coin in distilled water for several hours or overnight, and see if any of the deposit can be dislodged with a toothpick.</p><p><br /></p><p>You might be able to remove some, but not all of the deposits. At this point I would leave the coin alone and let it tone. Once the bright areas start to darken naturally, over time, the coin will look better. </p><p><br /></p><p>The reason I suggest not to go further is that complete removal of the deposit might reveal a rough or corroded surface, or it might reveal a smooth surface - that's something of a gamble - you never know what lays beneath.[/QUOTE]</p><p><br /></p>
[QUOTE="robinjojo, post: 6541533, member: 110226"]You should buy some pure acetone. The diluted acetone is not very effective, as you noted. The 100% acetone makes a world of difference. Now you mentioned that soaking the coin had no effect on the obverse. Judging from the photos the obverse might have deposits of oxides and not PVC deposits. Acetone has no effect on oxides. I just opened the image in Photoshop and enlarged it. It really does look like oxide buildup. So, I would suggest that you try soaking the coin in 100% acetone. The acetone will not affect the metal. If the deposit persists, try soaking the coin in distilled water for several hours or overnight, and see if any of the deposit can be dislodged with a toothpick. You might be able to remove some, but not all of the deposits. At this point I would leave the coin alone and let it tone. Once the bright areas start to darken naturally, over time, the coin will look better. The reason I suggest not to go further is that complete removal of the deposit might reveal a rough or corroded surface, or it might reveal a smooth surface - that's something of a gamble - you never know what lays beneath.[/QUOTE]
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