A "copper" Nickel Dollar Mystery... 1982 Constitution

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Author	Replies: 4 / Views: 1,467
SPP-Ottawa Moderator Canada 10458 Posts	Posted 03/15/2019 8:52 pm This little mystery came out of a paper-wrapped mint roll, and it has me scratching my head. This is not struck through bronze/copper fragments, this is not plated, and it does not come off with acetone or toluene... The reverse is spectacular, as portions of it shine like a newly struck bronze cent... I have no idea what I am seeing here... almost looks like a copper wash (The theory is that in the rinse bath, copper ions are preferentially liberated from previously washed 1c planchets, and then re-deposited on new batches of other coins when the solution becomes saturated) Or, a sintered coin (Sintering is caused by the small dust-sized copper or other metal that are removed from the planchets or the drum they spin in, it then sticks to the planchet and then is annealed to soften the planchet before striking. The annealing step bakes the sintering on). Anyone here able to provide some insight, and why both sides have much different degrees of "copper" finish? "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US My eBay store Report this Post to the Staff

oriole Pillar of the Community Canada 5240 Posts	Posted 03/15/2019 8:55 pm @SPP, if I saw this I would be asking you! Report this Post to the Staff
SPP-Ottawa Moderator Canada 10458 Posts	Posted 03/15/2019 9:13 pm Another photo, with a different light intensity and incident angle. "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US My eBay store Report this Post to the Staff
SPP-Ottawa Moderator Canada 10458 Posts	Posted 03/15/2019 9:15 pm Quote: @SPP, if I saw this I would be asking you! Yeah, I know... I am posting this in Mike Diamond's error forum, where some heavy error hitters frequent (e.g., Jon Sullivan, Fred Weinberg, etc...). I have seen tens of thousands of nickel dollars and 50c coins, and never have seen this before... "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US My eBay store Report this Post to the Staff
oriole Pillar of the Community Canada 5240 Posts	Posted 03/16/2019 06:40 am What were the results of your XRF test? Report this Post to the Staff
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A "Copper" Nickel Dollar Mystery... 1982 Constitution