PROCESS FOR PRODUCING DECORATED GLASS-CERAMIC ARTICLES

摘要

A process for producing decorated glass-ceramic articles is described, an article of crystallisable glass being first decorated with a ceramic colour and then being converted into a glass-ceramic article by heat treatment with simultaneous burning-in of the ceramic colour, is improved by treating the glass article, before decorating, for 10 minutes to 50 hours with a Br?nsted acid at temperatures between 50 and 800.degree.C. As a result of this treatment, the surface layer of the glass article is modified in such a way that the layer of ceramiccolour sinks into the surface of the article during burning-in/ceramicising. The use properties of the glassceramic are themselves not changed as a result.