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<p>[QUOTE=&quot;Eduard, post: 3441980, member: 8959&quot;]This is my experience with acetone:</p><p><br /></p><p>I regularly use acetone on copper coins, ancient or new, to remove unsightly deposits. It has never harmed any of my coins. I do a first dip in clean acetone for 15-20 minutes to observe the effect. If progress is observed, I may continue the dip or not, as needed up to 1-3 hours. I have read about people dipping for 24 hrs as well. I have never tried that on copper, only on silver, with no problems.</p><p>Always handle acetone carefully. Wear gloves, and do not breathe the vapours.</p><p><br /></p><p>Acetone is a solvent with polarity such that it can remove both non-polar (oils, organic debris), as well as some polar deposits (pvc residue may fall into this category, I believe). It will not chemically interact with a surface, so it does not combat corrosion, verdigris, etc.</p><p>If acetone will not work, I then try toluene as it has a more pronounced non-polar character - I have been able to remove lacquer on lacquered coins that way which acetone will not dissolve.</p><p>Because of the oil removal, acetone treatment may leave a coin looking drab and lifeless. Be aware of that.</p><p><br /></p><p>It has been reported that under the influence of light and heat, acetone may degrade and form acetic acid (?), which will react with copper. For this reason, to be on the safe side, I avoid using acetone under direct sunlight, and also limit the time of exposure.[/QUOTE]</p><p><br /></p>

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