Process for obtaining a silver product which is black-colored in

Details Process for obtaining a silver product which is black-colored in Process for obtaining a silver product which is black-colored in

1982-11-08

1984-08-28

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164 80, B22D 2500

Patent

active

044678568

ABSTRACT:
According to the invention, a silver product which is black-colored in its whole mass is obtained by pouring molten silver into molten sulfur or by heating silver pieces in the presence of sulfur pieces or still by subjecting silver sheets or silver threads to sulfur vapors until complete oxidation of the silver, by converting in powder the oxidized silver and by heating the powder thus obtained preferably in the presence of a flux. The product thus obtained may be used for the manufacture of jewels which comprise at least a portion made of black silver colored in its mass.

REFERENCES:
patent: 2963530 (1960-12-01), Hanks
patent: 3411566 (1968-11-01), Astrou

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