2006 D Colorado Quarter, PMD Or Missing Cupronickel Layer?

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Author	Replies: 7 / Views: 125
Roller42 Valued Member United States 109 Posts	Posted Today 5H 40M ago Found this one in the same box as the 2011 D Glacier quarter I just uploaded. Colorful Colorado, indeed! It looks like a copper quarter. It appears to be missing the outer cupronickel layer. My gut says it is PMD, maybe acid treated or something. It also appears to be slightly smaller than a quarter and there is very little evidence of reeding on the edge. I wonder if there is some acid that can dissolve nickel but leaves copper alone? Weight is 5.68 g, which seems weird if there were outer layers missing. Just another oddball CRH find and I look forward to opinions! Report this Post to the Staff

jbuck Moderator United States 192762 Posts	Posted Today 5H 24M ago Just toning, weight tells you layers are intact. It looks like it spent some time circulating through vending machines. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
Roller42 Valued Member United States 109 Posts	Posted Today 5H 18M ago Found this googling around. Quote: anodic (reverse) electrostripping using a sulfuric acid electrolyte can dissolve a nickel layer off a copper substrate without significantly attacking the underlying copper. If this was the case I would expect it to weigh less. At 5.68 it's almost right on spec. Maybe a casino quarter that has been copper plated? Report this Post to the Staff
jbuck Moderator United States 192762 Posts	Posted Today 5H 12M ago Keep in mind it is not a nickel layer. It is a cupro-nickel layer. The outside layers are alloy of 75% copper and 25% nickel. I doubt it is plated. More likely it is just toned. I have seen plenty of coppery toned clad coins. I like them. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
Errers and Varietys Bedrock of the Community United States 76905 Posts	Posted Today 4H 46M ago Could it be a Dryer Coin or spooned? Errers and Varietys. Report this Post to the Staff
Brandmeister Pillar of the Community United States 6734 Posts	Posted Today 4H 5M ago Also keep in mind that many chemical processes will interact differently with the 25% nickel than the 75% copper. For example, you can pull a very thin layer of copper to the alloy surface by heating red hot with a blowtorch and then quenching in methanol (not recommended, IMO). dL0vs_GptcM Report this Post to the Staff
Dearborn Moderator United States 102438 Posts	Posted Today 1H 48M ago neat experiment Brand - only one I would try if I were right up against my pool (lots of water) But this coin is all beat up on the edge, probably from mechanical machines (venting or casino slot machines, and the color is just toning. Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
Roller42 Valued Member United States 109 Posts	Posted Today 54M ago Here's one more view. Sometimes I find that a 600 dpi scan on a cheap flatbed scanner produces better images than my fancy schmancy USB scope. Quote: I have seen plenty of coppery toned clad coins. I like them. I'll be happy to send it to ya, Jbuck. Just e-mail me an address. Report this Post to the Staff
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