Cerdec Aktiengesellschaft Keramische Farben

Giacinto Monari

J&ouml;rg Wacker

Gillian-Ann Jaschik

Jurgen Hanich

The invention provides new stains which fire to a red-brown color for coloring ceramic compositions. The stains comprise Fe,O,and/or an Fe compound which forms Fe,O,on firing, in uniform distribution in a pulverulent matrix based on an oxide-like and/or silicate-like material which is amorphous to X-rays to the extent of at least 50% and has a specific surface area (BET) of at least 40 m,/g, and are obtainable by bringing the constituents into intensive contact together. The matrix preferably comprises 80 to 100% amorphous SiO,or SiO,-rich silicate with a BET surface area of 90 to 300 m,/g and 0 to 20% of an auxiliary substance, such as silicone oil. The stains can be prepared by intensive dry grinding.

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Corlo, Italy

Giacinto Monari