Patent ID: 8309171

Claim:
A process for producing a decorative coating on a surface of a porcelain or ceramic article comprising the steps of: preparing a rhodium-free noble metal preparation of at least one organic noble metal compound including an organic gold compound, at least one flux that consists of organometallic compounds, including Cr in the form of at least one organic compound, such that a Cr content is 0.01 to 1.0 mole per mole of noble metal, and at least one vehicle, wherein the bright noble metal preparation has a noble metal content of 6 to 20 wt. % based on the preparation and at least one other element selected from the group consisting of Si and Ni in the form of organic compounds, such that a total content of Si, Cr, and Ni is 0.2 to 2.0 moles per mole of noble metal; applying the preparation on the surface of porcelain or a tile; and firing the noble metal preparation at a temperature of 900° C. to 1300° C. to produce a bright decorative coating on the surface of the ceramic or porcelain article.