Abstract: New para-phenylenediamines suitable for use in the oxidative dyeing of hair are described which provide useful "background" green shades. These compounds have the formula: ##STR1## in which n is an integer from 2 to 6 and R denotes an unsubstituted or mono- or poly-hydroxy substituted linear or branched alkylene group containing up to 6 carbon atoms, which alkylene group can optionally contain one or more ether groups.

Abstract: The invention provides compositions which comprise, in an aqueous, alcoholic or aqueous-alcoholic vehicle, at least one compound of the general formula: ##STR1## in which R denotes a monohydroxyalkyl radical containing from 2 to 6 carbon atoms or a polyhydroxyalkyl radical containing from 3 to 6 carbon atoms. These dyeing compositions make it possible to obtain, on the hair, yellow shades with a very high chromaticity and possessing very good fastness to light and to washing.

Abstract: Compounds having the general formula: ##STR1## in which R denotes hydrogen, a lower alkyl, lower hydroxyalkyl or lower polyhydroxyalkyl radical or alternatively an alkyl, hydroxyalkyl or polyhydroxyalkyl radical in which the alkyl chain is interrupted by one or more hetero-atoms such as oxygen are described. These compounds can be used in dyeing compositions for keratin fibres and wavesetting lotions. They make it possible to obtain very strong shades.

Abstract: Novel compounds of the general formula ##STR1## wherein Z represents a substituted lower alkyl radical; each of R.sub.1 and R.sub.2 is hydrogen atom, a lower alkyl or a substituted lower alkyl identical with or different from Z and the functional groups NO.sub.2 and NR.sub.1 R.sub.2 can occupy all ring positions in relation to OZ, with the exception that if Z is .beta.-hydroxyethyl, --NO.sub.2 is in the 4 position and --N(R.sub.1)(R.sub.2) is in the 2 position then either R.sub.1 or R.sub.2 is other than hydrogen.The novel compounds are for dyeing human hair in a variety of yellow shades. The compounds of formula (I) may be used as aqueous or water-alcohol solutions to form dye compositions for dyeing human hair.

Abstract: Novel compounds of the general formula ##STR1## wherein Z represents a substituted lower alkyl radical; each of R.sub.1 and R.sub.2 is hydrogen atom, a lower alkyl or a substituted lower alkyl identical with or different from Z and the functional groups NO.sub.2 and NR.sub.1 R.sub.2 can occupy all ring positions in relation to OZ, with the exception that if Z is .beta.-hydroxyethyl, --NO.sub.2 is in the 4 position and --N(R.sub.1)(R.sub.2) is in the 2 position then either R.sub.1 or R.sub.2 is other than hydrogen.The novel compounds are for dyeing human hair in a variety of yellow shades. The compounds of formula (I) may be used as aqueous or water-alcohol solutions to form dye compositions for dyeing human hair.

Abstract: The invention relates to compositions intended for dyeing keratin fibers which contain, as the only oxidative dyestuffs, oxidative dyestuff precursors of the para type and of the ortho type, at least one said precursor of the para type being an aromatic diamine, or specified formula or a specified bis-condensed precursor and at least one said precursor of the ortho type which is an ortho-aminophenol, ortho-diphenol, ortho-phenylenediamine or a derivative thereof.

Abstract: A dyeing composition for keratinic fibers, especially human hair, comprising an aqueous solution containing a dyeing amount of at least one dye compound having the formula: ##STR1## in which R.sub.1 is --(CH.sub.2).sub.n --OR, R is methyl or ethyl, n is 2 or 3, or one of the corresponding acid salts.

Abstract: The invention relates to compositions intended for dyeing keratin fibres which contain, as the only oxidative dyestuffs, oxidative dyestuff precursors of the para type and of the ortho type, at least one said precursor of the para type being an aromatic diamine, of specified formula or a specified bis-condensed precursor and at least one said precursor of the ortho type which is an ortho-aminophenol, ortho-diphenol, ortho-phenylenediamine or a derivative thereof.

Abstract: A dye composition for keratinic fibers comprises in an aqueous or hydroalcoholic solution at least one coupler of the formula ##STR1## wherein R is hydroxyalkyl containing 1-4 carbon atoms, and at least one oxidation base.