Abstract: An electrically nonconductive copper-boron coating is deposited on a nonmetallic surface such as glass by reducing a copper salt with a small amount of alkali metal borohydride in the presence of a complexing agent such as Rochelle salt or ethylenediamine tetraacetate salts. The resultant copper-boron coated article may subsequently be heated until it acquires a copper-bronze appearance by reflection.

Abstract: An electrically nonconductive copper-boron film is deposited on the surface of a substrate, particularly a nonmetallic substrate such as glass, by reducing a copper salt with a small amount of alkali metal borohydride in the presence of a complexing agent such as Rochelle salt or ethylenediamine tetraacetate salts. The resultant copper-boron coated substrate may be further heated until it assumes a copper-bronze appearance by reflection, resulting in a copper-boron coated article, or the copper-boron coated substrate may be subjected to chemical reduction, resulting in a copper coated article of superior uniformity.

Abstract: Gold films are deposited on non-metallic substrates very rapidly at ambient temperatures by sensitizing and activating a surface of a non-metallic substrate to be coated and subsequently contacting the activated surface with a solution containing a gold salt which is reduced to a metallic gold film in the presence of divalent mercury, cadmium or lead ions.