Process for imparting a dark patina to low-melting metal articles
OwnerMarion S. Cooleyinventor
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Abstract
A process for imparting a dark patina to the surface of an article formed from a low-melting alloy metal, the alloy metal being an alloy metal of two or more metals selected from the group consisting of Bi, Pb, Sn and Cd, comprising exposing the alloy metal surfaces of said article to an acid solution of a copper salt.
Claims5
A process for imparting a dark patina to the surface of an article formed from a low-melting alloy metal, the alloy metal being an alloy metal of Bi, Pb, Sn and Cd having a melting point below 350.degree.F, comprising exposing the alloy metal surface of said article to a mineral acid solution of a copper salt selected from the group consisting of copper sulfate, copper chloride and copper nitrate.
Dependencies are inferred from the claim text.