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<p>[QUOTE=&quot;robinjojo, post: 6541533, member: 110226&quot;]You should buy some pure acetone.&nbsp; The diluted acetone is not very effective, as you noted.&nbsp; 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.&nbsp; Judging from the photos the obverse might have deposits of oxides and not PVC deposits.&nbsp; Acetone has no effect on oxides.</p><p><br /></p><p>I just opened the image in Photoshop and enlarged it.&nbsp; It really does look like oxide buildup.&nbsp; </p><p><br /></p><p>So, I would suggest that you try soaking the coin in 100% acetone.&nbsp; The acetone will not affect the metal.&nbsp; 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.&nbsp; At this point I would leave the coin alone and let it tone.&nbsp; 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&#039;s something of a gamble - you never know what lays beneath.[/QUOTE]</p><p><br /></p>

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