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Difference between red and brown copper toning?
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<p>[QUOTE="Buddy Love, post: 2928027, member: 91504"]Yes, agree completely. I was responding to MrJason's question about red on copper, and also responding to Colonialjohn's misinformation that the copper oxide compound creates multiple colors. It does not.</p><p><br /></p><p>The OP wondered about the interaction of red and brown colors with other colors on copper coins. I was also trying to respond to that comment. I think there is a general mistrust or, moreover, general lack of understanding in the collecting community of colorfully toned copper coins. More knowledge and understanding is needed on how copper coins can tone naturally into either a rainbow of colors, or monochromatic colors. </p><p><br /></p><p>Copper sulfides combined with copper oxides are the primary cause of rainbow colors, and much of that can be explained by oxide and sulfide thin interference films. </p><p><br /></p><p>I agree that chemistry is complicated stuff. Suffice to say, though, that copper compounds can cause copper to take on vibrant natural colors, especially blues and greens, and in monochromatic form. That is to say, copper coins don't necessarily naturally turn just red and brown.[/QUOTE]</p><p><br /></p>
[QUOTE="Buddy Love, post: 2928027, member: 91504"]Yes, agree completely. I was responding to MrJason's question about red on copper, and also responding to Colonialjohn's misinformation that the copper oxide compound creates multiple colors. It does not. The OP wondered about the interaction of red and brown colors with other colors on copper coins. I was also trying to respond to that comment. I think there is a general mistrust or, moreover, general lack of understanding in the collecting community of colorfully toned copper coins. More knowledge and understanding is needed on how copper coins can tone naturally into either a rainbow of colors, or monochromatic colors. Copper sulfides combined with copper oxides are the primary cause of rainbow colors, and much of that can be explained by oxide and sulfide thin interference films. I agree that chemistry is complicated stuff. Suffice to say, though, that copper compounds can cause copper to take on vibrant natural colors, especially blues and greens, and in monochromatic form. That is to say, copper coins don't necessarily naturally turn just red and brown.[/QUOTE]
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