Pls Explain Thêse Marks - Coin Community Forum

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Author	Replies: 3 / Views: 1,067
Oletsdewit Valued Member United States 113 Posts	Posted 05/22/2015 11:25 pm Ít circles the coin Report this Post to the Staff

amida17 Pillar of the Community United States 4897 Posts	Posted 05/22/2015 11:33 pm Severe deterioration of the die. Radial flow lines. I believe....? Quote: COLD METAL FLOW - This is the ability of a metal to be shape formed by an outside force without heating that metal. In coining, the dies are convex shaped (higher in the center that the rim) and when they strike the planchet, metal from the center of that planchet is forced outward in a radial pattern. This action is similar to dropping a pebble into a body of water. The displacement of the water caused by the intrusion of the pebble will cause a wave of water to travel outward from that center. from here.... http://www.error-ref.com/cold-metal-flow/ Edited by amida17 05/22/2015 11:36 pm Report this Post to the Staff
koinpro Pillar of the Community United States 1781 Posts	Posted 05/22/2015 11:45 pm At a couple of the private mints I work with they call it "bluing" for reasons I don't know. The United States Mint calls it "Sunburst." It is notorious on yellow-brass and some mints cringe when they have to run it as they need to wipe the dies very frequently. Its a form of Die Deterioration. Edited by koinpro 05/22/2015 11:46 pm Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 05/22/2015 11:50 pm Correct. Die wear from striking planchets. We get wrinkles, dies get die flow lines. Report this Post to the Staff
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