Carbazole derivatives and their use in cosmetics

A method of cosmetic treatment comprising applying a cosmetic composition to at least one of the skin, nails or hair;

• said cosmetic composition comprising a compound corresponding to the formula:
• ##STR16## in which, R.sub.1 represents a hydrogen atom, a benzyl radical, or a C.sub.1 -C.sub.16 alkyl radical which may or may not be branched and may or may not be saturated;
• R.sub.2 and R.sub.3 denote, independently of each other, a carbethoxy, acetyl, nitrile or ##STR17## radical, or a hydrogen atom, or R.sub.2 and R.sub.3 are selected from the group consisting of ##STR18## R.sub.4 represents a hydrogen atom, a methoxy, nitrile or nitro radical or a chlorine atom;
• R.sub.5, R.sub.7 and R.sub.8 represent, independently of each other, a hydrogen atom or a methoxy radical;
• R.sub.6 represents a hydrogen atom or a methyl radical;
• with the provisos that if R.sub.2 and R.sub.3 form the ring system (c), at least one of R.sub.1, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 does not denote a hydrogen atom and R.sub.2 and R.sub.3 are not simultaneously a hydrogen atom.

A cosmetic composition intended for the cosmetic treatment or for the coloration of keratinous substances, comprising, in a cosmetically acceptable medium, at least one pigment consisting of the compound corresponding to the formula:

• ##STR19## in which, R.sub.1 represents a hydrogen atom, a benzyl radical, or a C.sub.1 -C.sub.16 alkyl radical which may or may not be branched and may or may not be saturated;
• R.sub.2 and R.sub.3 denote, independently of each other, a carbethoxy, acetyl, nitrile or ##STR20## radical, or a hydrogen atom, or R.sub.2 and R.sub.3 are selected from the group consisting of ##STR21## R.sub.4 represents a hydrogen atom, a methoxy, nitrile or nitro radical or a chlorine atom;
• R.sub.5, R.sub.7 and R.sub.8 represent, independently of each other, a hydrogen atom or a methoxy radical;
• R.sub.6 represents a hydrogen atom or a methyl radical;
• with the provisos that if R.sub.2 and R.sub.3 form the ring system (c), at least one of R.sub.1, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 does not denote a hydrogen atom and R.sub.2 and R.sub.3 are not simultaneously a hydrogen atom.