IN WHICH X REPRESENTS A DIRECT LINKAGE,-CH2-, -CH2CH2-,-NH-OR-N(LOWER ALKYL)-, THE BENZENE NUCLEUS IS UNSUBSTITUTED OR SUBSTITUTED BY HYDROGEN, METHYL, LOWER ALKOXY, CARBOXYL, CHLORINE OR BROMINE, AND N STANDS FOR 0 OR 1, THE SAID DYESTUFFS BEING SUITABLE FOR THE DYEING OR PRINTING OF LEATHER OR OF FIBROUS MATERIALS CONSISTING OF WOOL, SILK, LINEAR POLYMIDES, NATIVE OR REGENERATED CELLULOSE FIBRES, THE DYEINGS OR PRINTS OBTAINED ON SAID MATERIALS BEING DISTINGUISHED BY VERY GOOD FASTNESS PROPERTIES TO WETTING AND TO LIGHT.