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<p>[QUOTE=&quot;desertgem, post: 1344494, member: 15199&quot;]The &quot;wood grain&quot; is a toning effect. It is not seen on a then newly minted coin which were bright evenly colored. Over time, a mismixed area of mainly copper ( tones darker) and copper/zinc ( tones less) produced an effect similar to the grain of wood through exposure to atmospheric or environmental effects ( mainly sulfur compounds). As mixing procedures for the metals improved in latter years, fewer were eventually seen.[/QUOTE]</p><p><br /></p>

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