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<p>[QUOTE=&quot;gsimonel, post: 2872313, member: 82549&quot;]No coin is pure copper, although some are pretty darn close. But they all contain trace metals.</p><p><br /></p><p>But more to the point, bronze disease is caused by the copper reacting to hydrochloric or hydrosulfuric acid, which is created when moisture in the area reacts with chemicals in the environment--environment meaning the air, the dirt that it was buried in, or even just hanging around on the surface of the coin. So yes, given the right conditions, copper coins can succumb to bronze disease. </p><p><br /></p><p>Just don&#039;t confuse bronze disease with the natural green patina that forms on the surface of a copper object over time. Patina is good for the object, BD is bad. If you can easily brush it off with a toothbrush, it&#039;s BD. Bad. If you can&#039;t, it&#039;s patina. Good. If it raises up above the surface, that&#039;s bad, too. Patina will just coat the surface and not change the topology. Good.[/QUOTE]</p><p><br /></p>

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