Patent ID: 6228160
Filing Date: 2001-05-08
Classification: C01P,C03C,C04B,C09C

Abstract:
A red-brown stain consisting of:(a) a coloring component comprising one or more iron compounds selected from the group consisting of Fe.sub.2 O.sub.3 FeOOH, Fe.sub.3 O.sub.4 and iron containing compounds which form Fe.sub.2 O.sub.3 on baking, and(b) a pulverulent matrix comprising 80 to 99.9 wt % of an oxide and/or silicate and 0.1 to 20 wt. % of one or more auxiliary substances selected from the group consisting of silicone oils, alkoxysilanes and lower condensation products thereof, said oxide and/or silicate (i) having a specific surface; area measured by the BET method (DIN 66131) of at least 40 m.sup.2 /g and (ii) being at least 50% amorphous,said coloring component, calculated as Fe.sub.2 O.sub.3, (1) being present in an amount of 1 to 25 wt. %, (2) being uniformly distributed in said pulverulent matrix and (3) being in intensive contact with said oxide and/or silicate of said pulverulent matrix.