Abstract: For improving the light-fastness of leather dyed with anionic dyes, the leather is treated, before, during or after dyeing, with a compound of copper.

Abstract: Iron complex dyes which are particularly suitable for dyeing leather in brown shades are obtained by coupling a naphthylaminesulfonic acid with resorcinol, subsequently coupling the reaction product with 4-nitro-2-aminophenol and metallizing with an iron compound.

Abstract: Process for the continuous trichromatic dyeing of synthetic polyamide materials which comprises using at least one blue-dyeing fibre-reactive sulfo-containing anthraquinone dye together with at least one red-dyeing sulfo-containing azo dye and at least one yellow- or orange-dyeing sulfo-containing azo dye.The process according to the invention is suitable for the continuous dyeing of synthetic polyamide materials from aqueous liquors, producing level dyeings having good fastness properties, in particular good ozone fastness.

Abstract: Metallizable azo dyes of the formula I ##STR1## wherein A is the radical of a diazo component of the benzene or naphthalene series, which diazo component contains in the o-position with respect to the azo group a metallizable hydroxyl group,R is methyl or chloromethyl, or phenyl which can be substituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or halogen,R.sub.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl,R.sub.2 is hydrogen or methyl,n is 0 or 1, andm is 0, 1, 2 or 3.In the form of their heavy-metal complexes, the dyes are suitable in particular for dyeing leather. These dyes are deeply colored, cover well, have good substantivity and build-up while simultaneously having good fastness properties.

Abstract: The dyes of the formula I indicated in patent claim 1 are suitable for dyeing furs and especially leather.They are preferably used as a mixture with a blue dye and a red dye for dyeing leather by the trichromatic process.

Abstract: The dyes of the formula I ##STR1## in which Me is cobalt or chromium, A and A' independently of each other are each the radical of an amine of the benzene series which carries the hydroxyl group in the o-position relative to the azomethine group, Ar.sub.1 and Ar.sub.3 independently of each other are each a substituted or unsubstituted phenylene or naphthylene radical, Ar.sub.2 and Ar.sub.4 independently of each other are each a substituted or unsubstituted benzene or naphthalene radical, m and n independently of each other are each 0 or 1, p is an integer from 3 to 6 and Ka.sym. is a cation, are suitable for dyeing polyamides, particularly wool and leather.

Abstract: The dyes of the formula I given in claim 1 are suitable for dyeing furs and especially leather.They are preferably used in admixture with one or more suitable yellow, blue or red dyes for dyeing leather in dark shades.

Abstract: Chrome-complex dyes of the formula (I) ##STR1## wherein the phenyl groups A and B independently of one another are each unsubstituted or are mono- or disubstituted by chlorine, methyl, ethyl, methoxy or ethoxy, and wherein Me.sup..sym. is a cation.The dyes are suitable for dyeing nitrogen-containing materials, particularly for dyeing wool in orange shades.

Abstract: The dyes of the formula I given in claim 1 are suitable for dyeing furs and in particular leather.They are preferably used in admixture with a blue dye and a red dye for the trichromatic dyeing of leather.

Abstract: A mixture of at least three selected 1:2 chromium or 1:2 cobalt complex dyes of different colors and belonging to the azo or azomethine series is used for dyeing leather and furs. The mixtures of dyes make it possible for the first time to dye leather by the trichromatic process.

Abstract: Chrome-complex dyes of the formula (I) ##STR1## wherein the phenyl groups A and B independently of one another are each unsubstituted or are mono- or disubstituted by chlorine, methyl, ethyl, methoxy or ethoxy, and wherein Me.sup..sym. is a cation.The dyes are suitable for dyeing nitrogen-containing materials, particularly for dyeing wool in orange shades.

Abstract: The dyes of the formula I indicated in patent claim 1 are suitable for dyeing furs and especially leather.They are preferably used as a mixture with a red dye and a yellow dye for dyeing leather by the trichromatic process.

Abstract: The dyes of the formula I indicated in patent claim 1 are suitable for dyeing furs and especially leather. They are preferably used as a mixture with a blue dye and a yellow dye for dyeing leather by the trichromatic process.

Abstract: 1:2 Metal complex dyes of azomethines of the formula ##STR1## wherein R is hydrogen, unsubstituted or substituted alkyl, aralkyl, aryl, alkylsulfonyl or arylsulfonyl, A is the radical of an aliphatic 1,2- or 1,3-diamine or of a carbocyclic or heterocyclic 1,2-diamine, B is the radical of an aromatic o-hydroxyaldehyde, Ar.sub.1 is an aromatic radical, m is 1 or 2, and Ar.sub.2 is an aromatic-carbocyclic or heterocyclic radical. These dyes are suitable for dyeing and printing polyamide materials. The dyes are distinguished by their excellent fastness properties, especially good lightfastness. They have good covering power; produce level dyeings; and have good fastness to washing, water, perspiration, alkali, acid, diffusion and rubbing. Strong yellow, yellowish brown, reddish brown, dark brown or olive brown shades are obtained.