Fremgangsmåder og reaktionoplösning til frembringelse af en patina

A patina is produced on a copper article using a reactive aqueous solution of copper salts and inorganic acid salts. A patina is produced on the surface of a copper or copper alloy article by cleaning the surface, applying an aqueous solution of copper salts and salts of inorganic acids and then drying while protecting against the weather. An Independent claim is also included for a reactive solution used in the above process and comprising an aqueous solution of copper salts and inorganic acid salts, preferably together with a wetting agent and a thickener.