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Difference between red and brown copper toning?
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<p>[QUOTE="desertgem, post: 2927466, member: 15199"]The luster is from the microscopic flow lines from striking. However as you quoted above from Doug, The fresh copper surface begins reacting immediately to the environmental air. The press room is not like NASA, there are volatile substances in the air that starts to react with the surface in a thin layer. This thin layer on the coin surface offers protection as time progresses from other reactive substances, and produces a slow change in tone over time. If any scrape or rub in circulation or damage removes some of it, then the pure interior copper will be exposed and react. If someone has put it into a more contaminated environment ( toning experiment <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> ) they will react with a different end product and produce colorations that are not normal for the rest of the coin surface. Jim[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 2927466, member: 15199"]The luster is from the microscopic flow lines from striking. However as you quoted above from Doug, The fresh copper surface begins reacting immediately to the environmental air. The press room is not like NASA, there are volatile substances in the air that starts to react with the surface in a thin layer. This thin layer on the coin surface offers protection as time progresses from other reactive substances, and produces a slow change in tone over time. If any scrape or rub in circulation or damage removes some of it, then the pure interior copper will be exposed and react. If someone has put it into a more contaminated environment ( toning experiment :) ) they will react with a different end product and produce colorations that are not normal for the rest of the coin surface. Jim[/QUOTE]
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Difference between red and brown copper toning?
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