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Overheated Planchet or PMD on 2017P Nickel?
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<p>[QUOTE="JCro57, post: 3218797, member: 92083"]I have never actually tried to "rub" the copper coating off should the copper particles surface on a nickel or other coin. I know it can get thick enough to form a shell and even flake off, and even come apart in entire sections. For some reason, Sacagawea and Presidential dollars only go to a deep grey; I have never seen a reddish-copper on the surface from those coins when over annealed.</p><p><br /></p><p>I guess it would depend at what stage the copper on the surface has ingrained and is now fused on to the surface layer of it to be able to actually rub it or buff it out.</p><p><br /></p><p>As to exactly why some only turn grey/black while others become a rusty-red, why some appear on the entire surface while others have spots or streaks, why some only have red on one side, etc., is something I really do not understand.[/QUOTE]</p><p><br /></p>
[QUOTE="JCro57, post: 3218797, member: 92083"]I have never actually tried to "rub" the copper coating off should the copper particles surface on a nickel or other coin. I know it can get thick enough to form a shell and even flake off, and even come apart in entire sections. For some reason, Sacagawea and Presidential dollars only go to a deep grey; I have never seen a reddish-copper on the surface from those coins when over annealed. I guess it would depend at what stage the copper on the surface has ingrained and is now fused on to the surface layer of it to be able to actually rub it or buff it out. As to exactly why some only turn grey/black while others become a rusty-red, why some appear on the entire surface while others have spots or streaks, why some only have red on one side, etc., is something I really do not understand.[/QUOTE]
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