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<p>[QUOTE=&quot;GDJMSP, post: 894625, member: 112&quot;]Copper is the most reactive, well except maybe the manganese in the dollar coins, of our coinage metals. So the least little thing causes it to change color. It can be something as simple as differences in the air from one town to another.</p><p><br /></p><p>But it can also be the metal itself. Copper from one mines is a different color than copper from another mine. Even once refined and purified it is still a different color. Same for gold and silver even. Even when considered pure, there are still trace elements that change the color.[/QUOTE]</p><p><br /></p>

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