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<p>[QUOTE=&quot;desertgem, post: 982866, member: 15199&quot;]Copper(1) oxide&nbsp; Cu2O has a reddish color</p><p>Copper(2) oxide CuO has a blackish color</p><p><br /></p><p>The one listed as &quot;normal&quot; has a specific proportion of the 2 oxides along with various sulfide and environmental elements</p><p>The one on bottom left has a higher proportion of CuO, whereas the one on the right has a higher proportion of Cu2O, both along with environmental compound reactions ( often read of such red coins as being exposed to iron&nbsp; if it has been in soil&nbsp; ). IMO.</p><p>High levels of CuO is small spots are often called &quot;carbon spots&quot; due to their color, but not produced by carbon reactions. </p><p><br /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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