Kennedy With Defective Planchet Or Something Else? Wild Surface... - Page 2

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Author	Replies: 18 / Views: 2,137	Page: of 2

jbuck Moderator United States 188770 Posts	Posted 06/04/2019 3:38 pm Quote: I've seen it before. Usually on the surfaces of coins that have been recovered from sewers. 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
fortcollins Pillar of the Community United States 3653 Posts	Posted 06/04/2019 10:45 pm Quote: I've seen it before. Usually on the surfaces of coins that have been recovered from sewers. Apparently silt on the surfaces dries and cracks exposing the coin surfaces in the cracks to the acidic sewer water which eats away at the surface in the shape of the cracks. Spot on. Cupronickel alloys are susceptible to erosion corrosion. A caustic environment with heavy liquid flow - like a sewer - can corrode common 70-30 cupronickel. The outer clad layer here is 75-25, which has similar enough properties. I'll bet the copper clad layer is discolored, but largely unaffected. Report this Post to the Staff
Earle42 Bedrock of the Community United States 10038 Posts	Posted 06/04/2019 11:15 pm Very educational! I am glad someone knew what this was. So we can flush the idea of the freeze and heat method down the drain. ...that was a pun gents. I know, the puns stink. Two thirds of a pun: P U How much squash could a Sasquatch squash if a Sasquatch would squash squash? Download and read: Grading the graders Costly TPG ineptitude and No FG Kennedy halves https://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2 Edited by Earle42 06/04/2019 11:46 pm Report this Post to the Staff
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