Abstract: A process for the preparation of a vat dye of the dianthraquinone-azine or dianthraquinone-N,N'-dihydroazine series, or a higher cyclic homologue thereof, which comprises reacting a primary amine selected from the group consisting of amino anthraquinones, their substitution products and higher cyclic homologues, with an alkaline condensing agent, wherein reaction is effected in the presence of at least one oxide of an organic derivative of a metalloid element of Group 5B of the Periodic Classification of the elements.

Abstract: The preparation of pigment compositions with a copper phthalocyanine base, stable to crystallization is described.There is incorporated in the copper phthalocyanine pigments to be stabilized a compound of the general formula: ##SPC1##Wherein Pc represents a phthalocyanine residue, moiety or radical, X represents oxygen or sulfur or --NH-- bridge, R.sub.1 represents halogen or alkoxy, trifluoromethyl, trifluoromethoxy, cyano, carboxy, nitro, N-alkylamino or N,N-dialkylamino, R.sub.2 represents hydrogen, or alkyl or alkoxy group, R.sub.3 represents hydrogen or alkyl, n is a number from 1 to 8, R.sub.1, R.sub.2 and R.sub.3 may occupy the ortho, meta or para positions of the benzene ring.The pigment compositions according to the invention are particularly well suited for the coloring of printed inks.

Abstract: Process for the preparation of an anhydrous base or salt of a dyestuff of the Auramine series, which comprises isolating the base or salt in acetone, methylethylketone or diethylketone; products prepared by such a process; the hydrofluoride of the base of Auramine O; the phosphate of the base of Auramine O; the hydrobromide of the base of ethylauramine; the phosphate of the base of ethylauramine; the hydrofluoride and phosphate of the base of Auramine G and paper, inks, textile fibers, leather or plastics materials colored by the hydrofluoride of the base of Auramine O; the phosphate of the base of Auramine O; the hydrobromide of the base of ethylauramine; the phosphate of the base of ethylauramine.

Abstract: A concentrated phosphate solution of the base of a dyestuff of the Auramine series in a hydrophilic solvent (I), which solution is stable to storage and anhydrous; processes for the preparation of such a solution and use of such a solution for colouring paper or inks for flexography.