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<p>[QUOTE=&quot;BadThad, post: 1681086, member: 17261&quot;]Not really &quot;oxidation&quot; but toning (the changing of color due to several different chemical factors). Copper oxidizes in two steps, in the first phase copper will take on a slightly darker red color. In the second phase it will turn black.</p><p><br /></p><p>Blj0145 - This is known as a &quot;woody&quot; to us copper collectors. It happens due to a poor mixing of the copper alloy (copper/zinc/tin) in the planchet. Since all metals tone differently, the result is the woodgrain look.[/QUOTE]</p><p><br /></p>

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