Abstract: Tetrakisazo dyes of formula (I), as defined in claim 1, optionally in admixture with trisazo dyes of formula (X) as defined in claim 4, are valuable anionic dyes for the dyeing of substrates dyeable with anionic dyes, in particular for the dyeing of leather in very intense dark shades.

Abstract: Azothiophene disperse dyes of Formula (1) ##STR1## in which R, R.sup.1, R.sup.2 and R.sup.3 each independently is alkyl or alkenyl and mixtures thereof with other dyes are useful for dyeing synthetic textile material or a fiber blend thereof such as secondary cellulose acetate, cellulose triacetate, polyamide, polyacrylonitrile and aromatic polyester.

Abstract: A dye mixture, which comprises as component (A) a dye of formula as component (B) a dye of formula ##STR1## and/or as component (C) a dye of formula ##STR2## wherein D, X and Y are as defined in the specification. These dyes are particularly suitable for dyeing polyester fiber textile material.

Abstract: The present invention relates to colorant blends comprising (a) an azo component, which is a salt of a salt-forming azo pigment of the formulaA--N.dbd.N--B,wherein A is the residue of a diazo component and B is the residue of a coupling component; and (b) a second component, which is an opaque 1,4-diketo-3,6-diaryl-pyrrolo?3,4-c!pyrrole pigment. The colorant blends are especially useful in coating compositions, such as paints.

Abstract: Azo dyes of the formula ##STR1## where the ring A may be benzofused,n is 0 or 1, and R.sup.1 -R.sup.8 are as defined,as pH-dependent markers for hydrocarbons, hydrocarbons containing the above-mentioned azo dyes, and a method for detecting these azo dyes in hydrocarbons.

Abstract: Dye mixtures which comprise at least one dye of the formula ##STR1## and at least one dye of the formula ##STR2## in which Y.sub.1 is a radical of the formula ##STR3## and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, X.sub.1, X.sub.2, X.sub.3, L, W.sub.1, B.sub.1, A.sub.1, and A.sub.3 are as defined in claim 1.The dye mixtures according to the invention are particularly suitable for dyeing or printing natural or synthetic polyamide fibre materials.

Abstract: A blue type disperse dye mixture comprising 1.0 part by weight of at least one dye of the formula (1), from 0 to 0.2 part by weight of at least one dye of the formula (2), from 0.05 to 1.0 part by weight of at least one dye of the formula (3) and from 0.05 to 1.0 part by weight of at least one dye of the formula (4): ##STR1## wherein X is a chlorine atom or a bromine atom, R.sup.1 is a C.sub.1-5 alkyl group, R.sup.2 is a C.sub.1-4 alkyl group, and R.sup.3 is a C.sub.1-5 alkyl group or an allyl group, provided that R.sup.1, R.sup.2 and R.sup.3 may, respectively, be the same or different among the formulae (1) to (4).

Abstract: A blue type disperse dye mixture comprising a monoazo dye of the formula (1) in an amount of 1.0 part by weight and at least one of anthraquinone dyes of the formulae (2) to (4) in a total amount of from 0.2 to 3.