Silver color proof coin or medal and method of making the same

Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...

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204146, 148 2, 29DIG16, 29 90R, 40 275, B22D 11126

Patent

active

040633462

ABSTRACT:
A silver color coin or medal is produced from a copper-silver alloy containing from about 30 to 60% by weight of silver. The normal rose color caused by the copper in the alloy is removed by selective electrolytic etching.

REFERENCES:
patent: 1698486 (1929-01-01), Yungblut
patent: 1818379 (1931-08-01), Cain et al.
patent: 2285308 (1942-06-01), Specht
patent: 3429751 (1969-02-01), Heuse
patent: 3533863 (1970-10-01), Lee et al.

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