Water-soluble tetrakisazo dyestuffs derived from 4,4'-diaminoazobenzene

Claim 1

Dyestuff of the formula: ##STR7## wherein C 1 is selected from the group consisting of ethyl-acetylacetate-2 yl; 1-phenyl-3-methyl-4-yl-5-pyrazolone, in which the benzene nucleus is substituted by a sulphonic acid group in the 3' or 4' position or by two sulphonic acid groups in the 2', 5' positions and by from 0 to 2 chlorine atoms; 1-(4'-sulphophenyl)-4-yl-3-carboxy-5-pyrazolone; acetoacetanilide-2-yl; phenol-yl; 1,3-dihydroxybenzene-yl; 1,3-diaminobenzene-yl; 2,4-diaminotoluene-yl; and 1-aminonaphthalene-yl-6- or 7-sulpho; C 3 is a phenyl substituted by one sulphonic acid group in the 3 or 4 position or by two sulphonic acid groups in the 2,5-positions or by one sulphonic acid group in the 2- and one methyl in the 4-positions or by one sulphonic acid group in the 5- and one chloro in the 2-positions; X is OH or NH 2 ; each of the residues C 1 and C 3 having at least one and at most two sulphonic acid groups; C 1 is a residue of a coupling component C 1 H and C 3 is a residue of a diazotisable amine C 3 NH 2 .