Abstract: The present invention relates to agents for coloring keratin fibers which comprise at least one zwitterionic azomethine dye of the general formula (I), (II), or (III) in which z is a heterocycle of the formula in which R8 is an alkyl sulfonate radical of the formula (XIII);

Abstract: The agent for coloring hair contains at least one indigoid vat dye, at least one cationic compound, and as reducing agent at least one compound which in a strongly alkaline medium forms an enediol. In the method of coloring hair the pre-reduced indigoid vat dye and the cationic compound are applied to the hair and allowed to act on the hair at a pH of 4 to 11, preferably under protection from atmospheric oxygen. Then the vat dye is re-oxidized with atmospheric oxygen or an oxidant, such as hydrogen peroxide.

Abstract: The present invention relates to agents comprising cationic azacyanine dyes of the formula (I) for coloring keratin fibers, such as, for example, wool, silk or furs and in particular human hair (where X1 is N—R1, O or S and X2 is N—R2, O or S), and to a method of coloring hair with varying degrees of damage.

Abstract: The present invention relates to the use of cationic azacyanine dyes of the formula (Ia) or (Ib) for coloring keratin fibers, and to a method of coloring hair with various degrees of damage.

Abstract: The object of the present patent application is an agent for coloring keratin fibers based on oxidative dyes and which contains as developer at least one heterocyclic hydrazone derivative of formula (I) (with X?S or O) and as oxidant at least one persulfate salt, further objects being a multicomponent kit and a method for coloring keratin fibers by use of said agent

Abstract: The present invention relates to agents for coloring keratin fibers which comprise at least one zwitterionic azomethine dye of the general formula (I), (II), or (III) in which z is a heterocycle of the formula in which R8 is an alkyl sulfonate radical of the formula (XIII);

Abstract: The agent for dyeing hair has a pH of 4 to 11 and contains a reduced vat dye, which is obtained by reducing a vat dye, such as an anthrquinonoid dye, with a reducing agent compound that forms an enediol in an alkaline medium, preferably acetoin, monohydroxyacetone, and dihydroxyacetone. The method of dyeing hair includes pre-reducing the vat dye with the reducing agent compound at a pH of from 10 to 13 to form the reduced vat dye, providing an agent for dyeing the hair having a pH of from 4 to 11 and containing the reduced vat dye, allowing the agent to act on the hair while protecting the reduced vat dye in the agent from atmospheric oxygen, and then re-oxidizing with atmospheric oxygen or an oxidant.

Abstract: The present invention relates to the use of cationic azacyanine dyes of the formula (Ia) or (Ib) for coloring keratin fibers, and to a method of coloring hair with various degrees of damage.

Abstract: The present invention relates to agents comprising cationic azacyanine dyes of the formula (I) for coloring keratin fibers, such as, for example, wool, silk or furs and in particular human hair (where X1 is N—R1, O or S and X2 is N—R2, O or S), and to a method of coloring hair with varying degrees of damage.

Abstract: The object of the present patent application is an agent for coloring keratin fibers based on oxidative dyes and which contains as developer at least one heterocyclic hydrazone derivative of formula (I) (with X?S or O) and as oxidant at least one persulfate salt, further objects being a multicomponent kit and a method for coloring keratin fibers by use of said agent.