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Difference between red and brown copper toning?
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<p>[QUOTE="Colonialjohn, post: 2927507, member: 57741"]Buddy Love has the closest answer. Copper forms different oxides with various colors. We see more colors in older coppers and we see these different colors particularly in U.S. Colonial coins. I guess with longer time frames exposed to both sulfur and chlorine (chlorides) we have much more different colors on coppers than 20thC or even 19thC copper type coins. See Wikipedia on copper and its oxides - we see brown, black, green, orange and blue. Can't think of another at the moment ... different copper oxide compounds ... different colors ... not so much sulfur (copper sulfide) but mostly copper oxides.</p><p>I discuss this briefly in my new Amazon Book "Forgotten Coins." Soon ... very soon.</p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>
[QUOTE="Colonialjohn, post: 2927507, member: 57741"]Buddy Love has the closest answer. Copper forms different oxides with various colors. We see more colors in older coppers and we see these different colors particularly in U.S. Colonial coins. I guess with longer time frames exposed to both sulfur and chlorine (chlorides) we have much more different colors on coppers than 20thC or even 19thC copper type coins. See Wikipedia on copper and its oxides - we see brown, black, green, orange and blue. Can't think of another at the moment ... different copper oxide compounds ... different colors ... not so much sulfur (copper sulfide) but mostly copper oxides. I discuss this briefly in my new Amazon Book "Forgotten Coins." Soon ... very soon. John Lorenzo Numismatist United States[/QUOTE]
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Difference between red and brown copper toning?
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