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<p>[QUOTE=&quot;Just Carl, post: 103799, member: 4552&quot;]Actually verdigris refers to a reaction of Acetic acid on copper which is rather rare in coin damage since there is very little Acetic type acids floating around. The resulting reaction would be copper acetate. Although the greenish coloration found on many copper coins appears as that, it usually is a form of copper sulfite or sulfate. This sulfating reaction on coins is very prevelant in areas of the country where high sulfur content coals or iron are heated and the resulting S is given off in the air as SO or SO2 which combines with moisture in the air (H 0H) normally refered to as H2O. This air born acid attacks copper such as copper coins exposed to such an invironment and leaves a greenish residue. It is easily stopped by soaking in a highly purified form of Acetone or a light baking soda in distilled water solution and then blow dryed. However, note that the reaction has eaten away some of the copper so that part of the coin is damaged.[/QUOTE]</p><p><br /></p>

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