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<p>[QUOTE=&quot;calcol, post: 2547898, member: 77639&quot;]Reagent grade acetone dispensed from its original container will not leave a film in and of itself. If you are using painter&#039;s grade acetone or nail polish remover, it will have impurities in it. However, if an object has a film of a substance that can be affected by acetone other than completely dissolved, then spots or haze may appear.&nbsp; If the substance is very soluble in acetone and there is not much of it, then a quick rinse or dip will remove it.&nbsp; Examples: lubricating oils, petroleum jelly. If the substance is not very soluble in acetone, then short exposure to acetone may alter its appearance so that it become noticeable. Examples: PVC residue or doctoring putties.</p><p><br /></p><p>It&#039;s also possible that a substance, like oil or grease, that is soluble in acetone could be on a coin and covering spots or roughness.&nbsp; Some coin doctors are experts in doing this, but it can happen innocently too.&nbsp; When the substance is removed with acetone, the spots or roughness reappear.&nbsp; It&#039;s easy to conclude that the acetone harmed the coin when all it did is reveal the true nature of the coin&#039;s surface.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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