Colouring ceramic surface blue, lilac or esp. pink - by treating with aq. soln. of gold salt, drying and firing at suitable temp., suitable for overall colour or pattern prodn.

摘要

Process treating the surface with an aq. soln. (I) of a Au salt (II) contg. 0.1-10% Au, then drying and decomposing (II) at 300-1400 deg.C. (II) is pref. AuCl3 or HAuCl4. (I) contains 0.3-5.0% (II) and is applied by spraying, immersion, painting or printing. (II) is decomposed at 800-1200, esp. 1140 deg.C. USE/ADVANTAGE - Useful in the prodn. of e.g. tiles and porcelain crockery. A pure pink colour, penetrating to a depth of ca. 0.5-2 mm, can be obtd. very easily by firing above 1000 deg.C whilst blue is obtd. at 300-400 deg.C and lilac at 400-1000 deg.C. Both patterns and overall colours can be obtd. and the nature of the ceramic material has little effect on the colour.