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<p>[QUOTE=&quot;Just Carl, post: 107355, member: 4552&quot;]As I already said I&#039;ve tried just about everything I could find to clean coins. I&#039;ve only done it on coins that were already messed up or of little coin value. With copper coins that have a green type corrosion on them it is usually from a reaction of the copper with a sulfur type acid in the air. I&#039;ve found it is easily removed with any good base. I&#039;ve used baking soda in distilled water to dissolve the contamination, however, it must be noted that the greenish material is partially copper meaning a loss of material on the coin. This is common in areas where sulfur rich coal is burned such as in mills, factories and power stations. Traces of SO and SO2 enter the air, combine with H OH, a Hydrogen Hydroxide none as water, to form air born sulfurous or Sulfuric Acid. This attacks copper coins, piping, etc and forms CuSO3 or 4. </p><p>For cleaning with out damage the only thing I&#039;ve been able to find is Kerosine or Acetone. Then a distilled water rince and hair dryer blow dry. </p><p>The worst thing I&#039;ve used is putting a coin in Coke and leaving it there for a week. Heating coins over a stove just turned them different colors similar to dish soap. I&#039;ve tried WD40 and several other similar products that made the coiins shine but after a good rinse with water and hot hair dryer, ended up looking pretty much the same as when I started. Tarn-X really makes all coins shine but I&#039;ve leaned that if one on top of the other you must remember to stir occationally. Phosphoric Acid and pure Amonia are similar to Tar-x and I wonder if it contains some. </p><p>Hoever, if you value a coin don&#039;t do any of the above.[/QUOTE]</p><p><br /></p>

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