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<p>[QUOTE=&quot;desertgem, post: 1924246, member: 15199&quot;]By what ever name you wish to use, it is copper corrosion. The coin in its lifespan of 125 years, ( during much of which coin protection of modern use&nbsp; was not available), met environmental conditions which were less than perfect. All of the terms we use for corrosion such as toning, verdigris, bronze disease, carbon spots, PVC damage,&nbsp; are results of copper metal being degraded by other chemicals over time.[/QUOTE]</p><p><br /></p>

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