Vat dyes obtainable by a) halogenation of dibenzanthrone with bromine in the presence of chlorosulphonic acid and a halogenation catalyst up to a bromine content of 26 to 32% by weight and a chlorine content of 1 to 5% by weight, and b) condensation of the isolated halogenation product with 1-aminoanthraquinone in a molar ratio of 1 : 2 to 1 : 2.5 in the presence of an inert solvent, the concentration of halogenated dibenzanthrone and 1-aminoanthraquinone together being at least 200 g/l of solvent, and their use for dyeing or printing cellulosic textile material.
