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<p>[QUOTE=&quot;Just Carl, post: 108756, member: 4552&quot;]OK lawdogct, I just have been trying to say that with NORMAL contamination on copper coins it is copper sulfite or Sulfate. The amount scrapped off even ten copper coins would take a spectrometer to properly anylize. However, way back in a college lab we did take a pile of greenish pennies left out somewhere and dumped them into distilled water and heated. The resulting solution of greenish stuff was filtered and allowed to form crystals which ended up being CuSO4 through the shape of the actual crystals. </p><p>However, this proves nothing except that due to locations in the US the air contains different polutents of which in this area SO and SO2 are common. </p><p>Again, CH3COOH is just to heavy to be air born and form contaminates on coins. However, if left in your salad using vinagar as a dressing, you may also form a greenish color on the penny. Since it is the moisture in the air that carries that contaminates to your coins, just keep them in an air tight container. Presently I am trying to see what happens by putting copper coins in the freezer.[/QUOTE]</p><p><br /></p>

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