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Help identifying tin bronze anomaly in copper cent (1 reply)
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Need assistance in identifying a cause of a tin bronze occurring in 1910/1911 Lincoln wheat cent. Flake like features on a small run of Lincoln wheat cents have been identified. SEM/EDX reading shows flakes reading higher than normal SN and ZN. Copper cent should contain 95% CU and 5% ZN,SN. Flake readings are 86% CU 11%SN and 2.5%Zn, within these flakes there are multiple areas containing 64% CU and 33% SN. This flake becomes tin bronze and resists tarnish. I am trying to understand how this can occur. Any help would be greatly appreciated.