Abstract: The present invention relates to novel cationic dye of formula (1) wherein R1 and R7 are each independently of the other hydrogen, hydroxyl; unsubstituted or substituted C1–C6alkyl, aryl radical or C114 C6alkoxy; or —NR3R4, wherein R3 and R4 are each independently of the other hydrogen, unsubstituted or substituted aryl radical or C1–C6alkyl, and R2 is hydrogen, hydroxyl, unsubstituted or substituted C1–C6alkyl, aryl radical or C1–C6alkoxy, —NR3R4, or an organic radical of formula (2) wherein R5 is hydrogen, unsubstituted or substituted aryl radical or C1–C6alkyl, and X? is an anion. Further, the present invention relates to compositions thereof, especially comprising other dyes, to processes for the preparation thereof and to the use thereof in the dyeing of organic material, such as keratin, wool, leather, silk, cellulose or polyamides, and preferably human hair.

Abstract: The present invention relates to novel cationic dye of formula (1) and (1a) wherein A is an organic radical of formula (2) or (3) wherein R1 and R2 are each independently of the other unsubstituted or substituted C1–C14alkyl or an aryl radical, R3 is hydrogen, unsubstituted or substituted C1–C14alkyl, unsubstituted or substituted C1–C14alkoxy, cyan or halogenid, R4 is hydrogen, unsubstituted or substituted C1–C14alkyl or an aryl radical, and X? is an anion. Further, the present invention relates to compositions thereof, especially comprising other dyes, to processes for the preparation thereof and to the use thereof in the dyeing of organic material, such as keratin, wool, leather, silk, paper, cellulose or polyamides, and preferably human hair.

Abstract: The present invention relates to novel cationic dyes of formula (1), (2) or (3) wherein R1 and R2 are each independently of the other a C1–C8alkyl radical or an unsubstituted or substituted benzyl radical, R3 is hydrogen, C1–C8alkyl, C1–C8alkoxy, cyanide or halide, and R4 is a C1–C8alkyl radical or an unsubstituted or substituted aryl radical, and X? is an anion. Further, the present invention relates to compositions thereof, especially comprising other dyes, to processes for the preparation thereof and to the use thereof in the dyeing of organic material, such as keratin fibers, especially hair; or wool, leather, silk, cellulose or polyamides, and preferably human hair.

Abstract: A method of coloring porous material, especially human hair, is described, which method comprises applying to the material being colored, in any desired order successively, or simultaneously, a) a capped diazonium compound and b) a water-soluble coupling component under conditions such that, initially, coupling does not take place, and then causing the capped diazonium compound present on the material to react with the coupling component.

Abstract: A time and energy saving process for the preparation of a stable, aqueous emulsion for the dyeing of human hair comprises a) first heating a water phase containing water-soluble surfactants, salts and optionally other water-soluble additives to 50° and 90° C.; subsequently, b) while maintaining this temperature, adding solid fatty components having a melting point between 20° C. and the temperature actually applied according to a) between 50° and 90° C., stirring at this temperature until the solid fatty components are completely melted in the mixture, and, c) adding the remaining liquid fatty components to the composition thus obtained without any further heating.