Abstract: The oxidation hair dye composition for oxidative dyeing of hair is based on a combination of developer substance and coupler substance and contains at least one 3,4,5-triamino-pyrazole derivative compound selected from the group consisting of 1-methyl-3,4,5-triaminopyrazole, 3,5-diamino-1-methyl-4-methylaminopyrazole, 3,5-diamino-4-(2'-hydroxyethyl) amino-1-methylpyrazole and physiologically compatible, water-soluble salts of the foregoing pyrazole derivative compounds, as the developer substance. The invention also includes novel 3,4,5-triaminopyrazole derivative compounds.

Abstract: The oxidation hair dye composition contains from 0.01 to 4.0 percent by weight of a developer substance including at least one diaminopyrazole of the formula (I) ##STR1## wherein R.sup.1 is selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 carbon atoms, a hydroxyalkyl group having from 2 to 4 carbon atoms and a substituted or unsubstituted benzyl group, and R.sup.2 and R.sup.3, independently, are each selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 carbon atoms and a hydroxyalkyl group having from 2 to 4 carbon atoms; and from 0.01 to 4.0 percent by weight of a coupler substance including at least one m-phenylenediamine selected from the group consisting of N-(3-dimethylamino)phenyl urea and 3-(N-methylsulfonyl)amino-N,N-dimethylaniline.

Abstract: The subject matter of the present invention is directed to a process for producing 4,5-diaminopyrazole derivatives of the general formula (I) ##STR1## where R.sub.1 and R.sub.2 independently designate hydrogen, a C.sub.1 - to C.sub.6 -alkyl radical or a C.sub.2 - to C.sub.4 -hydroxyalkyl radical, which can be used as dye precursors, for example for hair dyes, and to new pyrazole derivatives.When using the process according to the invention good yields of isomer-pure 4,5-diaminopyrazole derivatives of general formula (I) can be obtained.

Abstract: The composition for oxidative dyeing of hair based on a combination of developer substances and coupler substances, contains as a developer substance 4,5-diamino-1-(4'-methoxybenzyl)pyrazole, 4,5-diamino-1-(4'-methylbenzyl)pyrazole, 4,5-diamino-1-(4'-chlorobenzyl)pyrazole, 4,5-diamino-1-(3'-methoxybenzyl)pyrazole, 4-amino-1-(4'-methoxy-benzyl) -5-methylaminopyrazole or 4-amino-5-(2'-hydroxyethyl)amino-1-(4'-methoxybenzyl)pyrazole.

Abstract: The hair dye composition includes at least one N-phenylaminopyrazole compound of the formula (V) ##STR1## wherein R.sup.1 is hydrogen, an alkyl group having from one to four carbon atoms or a hydroxyalkyl group having from two to four carbon atoms; R.sup.2 and R.sup.3 are each independently either a hydrogen, an amino groups or an alkyl group having from one to four carbon atoms; and R.sup.4 is hydrogen, an alkyl group having from one to four carbon atoms, an alkoxy group having from one to four carbon atoms or a halogen; and at least one conventional ingredient for hair dye compositions selected from the group consisting of emollients; preservatives; perfume oils; solvents; anionic, cationic, amphoteric and nonionic surfactants; thickeners; starch derivatives; cellulose derivatives; petrolatum; paraffin oil; fatty acids; conditioners; lanolin derivatives; cholesterol; pantothenic acid and betaines.

Abstract: The composition for oxidative dyeing of hair contains at least one coupler and 0.010 to 3.0 percent by weight of at least one developer selected from the group consisting of aminopyrazole derivatives of the formula (I): ##STR1## wherein R is selected from the group consisting of hydrogen and alkyl groups having one to four carbon atoms; n=2 or 3; and physiologically tolerated, water-soluble salts thereof. The developer and coupler substances are present in the composition in a total amount of from 0.1 to 5.0 percent. New pyrazole derivative compounds are also part of the invention.