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<p>[QUOTE=&quot;SuperDave, post: 2447592, member: 1892&quot;]If the toning is typical silver sulfide, acetone won&#039;t touch it. There&#039;s a very small but non-zero chance that during the coins life something got deposited on it which resulted in the color - the deposited substance itself adds the color - and if that &quot;something&quot; is organic the acetone could remove it. I sincerely doubt you&#039;ll run into this - the reverse of your coin is too nice, it&#039;s been carefully preserved - just mentioning it in the interest of full disclosure. </p><p><br /></p><p>Acetone is a real numismatic go-to. It removes leftover tape residue, wax, lacquer, all sorts of annoying stuff. As I mentioned, every raw coin I get (which doesn&#039;t have crud on the surface) goes into an acetone bath the moment I receive it. A &quot;PVC infestation&quot; is not visible at the beginning, and can resemble a hazy colorless surface for a while before it turns green. By the time it&#039;s green, it&#039;s time to act <b>decisively</b>. This is why I mention full immersion - you already know the coin has been exposed to PVC, but you don&#039;t know whether it&#039;s still in the formational process elsewhere on the coin.</p><p><br /></p><p>In the case of coins with crud/dirt/stuff on the surface, of course one must contemplate the effect of removing some or all of that crud, and often the right decision is not to touch it.[/QUOTE]</p><p><br /></p>

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