Abstract: The object of the invention is an agent for the oxidative dyeing keratin fibers, wherein it contains (a) at least one 4,5-diaminopyrazole derivative of Formulas (I), (II) or (III) or its salt with organic or inorganic acids as well as (b) at least one resorcinol derivative of the general Formula (IV)

Abstract: The object of the invention is an agent for oxidatively dyeing keratin fibers, wherein it contains (a) at least one 4,5-diaminopyrazole derivative of Formula (I), (II) or (III) or its salt with organic or inorganic acids, as well as (b) at least one pyrazol-5-one derivative of the general formula (IV), (V) or (VI), or its salt with organic or inorganic acids,

Abstract: The object of the invention is a colorant for brightening and coloring keratin fibers which contains (a) an oxidant and (b) at least one yellow direct dye of formula (I) and/or a red direct dye of formula (II) and/or a blue direct dye of general formula (III), and (c) has a basic pH 1

Abstract: The object of the invention is an agent for the oxidative dyeing keratin fibers, wherein it contains (a) at least one 4,5-diaminopyrazole derivative of Formulas (I), (II) or (III) or its salt with organic or inorganic acids 1

Abstract: The object of the invention is an agent for oxidatively dyeing keratin fibers, wherein it contains (a) at least one 4,5-diaminopyrazole derivative of Formula (I), (II) or (III) or its salt with organic or inorganic acids, 1

Abstract: The object of the present invention is the use of physiologically compatible salts of inorganic or organic acids for improving the absorption behavior of anionic, direct dyes, a 2-step method for dyeing fibers, as well as a multi-component agent for the non-oxidative dyeing of fibers (particularly keratin fibers, such as human hair), the one component of which contains a dyeing agent based on anionic, direct dyes and the other component of which contains the physiological compatible salts.

Abstract: The method for decolorizing fibers includes applying a decolorizing composition according to the invention to dyed fibers and allowing the composition to act on the fibers for a sufficient time to remove dyed color from the dyed fibers. The decolorizing composition for fibers dyed with an oxidation hair dye composition and/or direct-dyeing hair dye compounds contains a combination of one or more .alpha.-oxo-carboxylic acids and/or physiologically compatible .alpha.-oxocarboxylic acid salts with at least one reductone, or with at least one reductone and at least one thiol compound, or with at least one reductone and at least one sulfite compound, or with at least one reductone and at least one thiol compound and at least one sulfite compound. A multi-part kit for repeatedly dyeing and subsequently decolorizing fibers, especially human hair, contains both a dye composition for dyeing the fibers and the above-described composition for reductive decolorizing of the dyed fibers.