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<p>[QUOTE=&quot;Just Carl, post: 886558, member: 4552&quot;]Difficult to say without knowing what was used to polish or clean a coin. By polishing, one method is actually to use an auto polish. Not necessarily done to clean the coin, but used by many to demonstrate how great thier polishing product works. I&#039;ve purchased such coins for experimentation purposes and have had some, not always, decent results. Not long ago I placed a pile of such coins in Acetone, then rinsed with Alcohol, then&nbsp; soaked in Laquer thinner, then rinsed in distilled water. All done to remove any possible wax or polish. Eventually placed on a kitchen window sill and still there. Very slowly all are starting to tone down and acquire a slight natural look. Of course all now appear cleaned but no longer shine like a mirror. </p><p>Another similar experiment with a pile of similar coins was to just leave in Acetone for an extended period of time to disprove the statements that long exposures to Acetone can effect a coin. Oddly enough two of the Copper coins became bright Red, not the red people say about a new penny, but an actual bright RED. </p><p>Back to what to do so not to wait 100 years. There are many things you could do pending just how much you care about your coins. Again if they are polished with a compound, that would have to be removed. Soaking in Acetone, Laquer thinners, etc will help there. </p><p>Gently heat them over a gas stove. Not burn, just heat slowly. Also, try placing in dish soap and allowing to dry in the Sun without rinsing. Different dish soaps will give different results. Additives in Finger Nail Polish removers will also leave a residue that will make the coins appear to be toned down.[/QUOTE]</p><p><br /></p>

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