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<p>[QUOTE=&quot;Just Carl, post: 107825, member: 4552&quot;]Please, please stop calling the green contamination on copper coins Verdigris. I&#039;m not sure who started using that term but obviously was not a chem major. Verdigris is caused by the copper coin coming in contact with Acedic Acid forming Cu(C2H302)2.H OH. Please forgive the lack of lower case numerics. The 2 and 3 and 3 inside the () should be lowered but don&#039;t know how on a computer. That is known as Copper Carbonate. That is very unlikely to be the cause on coins. Unless you or someone has a source of Acedic Acid, that is not what causes the green colored contaminate. Copper reacting with normal air born contaminations of SO and SO2 with H OH forms a Sulfurous or Sulfuric Acid that creates CuSO3 or 4. Also, a greenish formation.[/QUOTE]</p><p><br /></p>

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