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<p>[QUOTE=&quot;John Burgess, post: 7993437, member: 105098&quot;]obverse looks like Copper(I) oxide Cu2O or cuprous oxide to me.</p><p>this color can manifest in a wet environment, with the addition of acid and a chloride for a period of time, like a fountain or pool or something like that. toning.</p><p><br /></p><p>a lot of times they tone brown from the air, sometimes toward yellow or red, with an acidic chloride water involved, or toward black (Copper(II) oxide CuO), depends on the environment and the contaminants involved. CuO would be from an alkali instead of an acid, and phosphates. maybe a ground environment?</p><p><br /></p><p>the green/blue type is like the statue of liberty Copper oxide CuO, cupric oxide, the basic copper and oxygen with sulfides and other air based contaminants.</p><p><br /></p><p>I am not a chemist, and there is some chemists here who I&#039;m sure will correct me, so I might not have it completely right in the &quot;how&quot; or &quot;why&quot; but it can occur naturally given the right environmental factors.</p><p><br /></p><p>As far as only on one side, who knows, one side got worn down more than the other after it happened? maybe it was sitting face up with a pocket of air under it? hard to say.</p><p><br /></p><p>the statue of liberty went solid green in about 5 years, and went to the pale blue grey green shade we all know after about 30 years.[/QUOTE]</p><p><br /></p>

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