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<p>[QUOTE=&quot;Kentucky, post: 1767971, member: 33176&quot;]Perhaps I am wrong, but &quot;mechanical&quot; cleaning involves touching the coin with something other than liquids or gases, and would HAVE to leave traces such as scratches.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>There are a few chemists on here, including myself, but you have to consider that you are talking about a very complex and extensive field in cleaning metals.&nbsp; It can not only involve inorganic chemistry but also organic chemistry, chemical kinetics, surface chemistry and metalurgy, just to name a few.&nbsp; Certain things are moderately certain - As Doug has said, little harm can come from distilled water, acetone, xylene (the dimethylbenzene you refer to), commercial coin dips and VerdiCare.&nbsp; Even in this group, I&#039;m sure Doug would tell you not to use acetone on copper because it can cause odd toning (gotta try this one myself to see). </p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Dimethylbenzene is xylene.&nbsp; Don&#039;t put it down the drain and use with adequate ventilation, kind of like gasoline.&nbsp; I don&#039;t think I would include mineral acids as abrasives, but I certainly would include baking soda (sodium hydrogencarbonate).</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Not that bad - but not that good.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Refer back to Doug&#039;s post about the 5 to use.&nbsp; Are there others - absolutely.&nbsp; I would include the alcohols, methanol, ethanol, isopropanol, and there are many, many organic solvents that would probably work.&nbsp; Maybe I&#039;ll write a book on that.&nbsp; : - )[/QUOTE]</p><p><br /></p>

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