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

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

1976-04-29

1977-12-20

Lanham, C.W.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

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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