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<p>[QUOTE=&quot;SuperDave, post: 2359238, member: 1892&quot;]By your numbers:</p><p><br /></p><p>1. If you are not actively treating something visible/notable on the coin - like visible green or haziness from PVC - a couple hours is <b>ample</b> as long as you &quot;swish&quot; rinse after so nothing redeposits from your original soak. Even at that I&#039;m probably - as is my way <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> - displaying excessive paranoia. For a coin you&#039;ve no reason to suspect, 10 minutes is probably sufficient. For efforts against visible stuff you would reasonably assume acetone to be effective against - that list is shorter than it might appear - well, the worst PVC infection I&#039;ve ever treated took a total of more than a week (168 hours) of actual soaking time and a couple weeks altogether.</p><p><br /></p><p>2. Use a bath of a type which will not allow the coin to lay flat. For me, that&#039;s various shotglasses keyed to the size of the coin. That way there&#039;s no question that both surfaces share the contact equally. It&#039;s also more conservative of acetone. I care not at all how much crud gets dissolved into a small amount of acetone because if it&#039;s that bad I&#039;ll probably use one or two extra soaks just to allay my fears of redepositing, after the coin looks fine visually.[/QUOTE]</p><p><br /></p>

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