Abstract: The invention relates to indoline compounds of formula (I): ##STR1## in which: R.sub.1 and R.sub.2 denote hydrogen, alkyl, monohydroxyalkyl, polyhydroxyalkyl, nitro, hydroxyl, alkoxy or NHR where R can be hydrogen, alkyl, monohydroxyalkyl or polyhydroxyalkyl;X denotes oxygen or sulfur;R.sub.3 represents --OR.sub.4 or NR.sub.5 R.sub.6 whereR4 denotes alkyl, alkenyl, benzyl, alkoxyalkyl or haloalkyl;R.sub.5 and R.sub.6 denote alkyl;R.sub.1 and R.sub.2 not simultaneously denoting hydrogen or nitro and when R.sub.1 denotes alkyl, alkoxy or mono- or polyhydroxyalkyl, R.sub.2 denotes NHR or hydroxyl,and to their use in dyeing keratinous fibers.

Abstract: The invention relates to a process for the preparation of a melanic pigment, comprising the polymerisation of a compound corresponding to the formula: ##STR1## in which: R denotes a hydrogen atom, an alkyl, alkoxy, hydroxyalkyl, SiR.sub.4 R.sub.5 R.sub.6 or aminoalkyl radical, or an aryl radical which is unsubstituted or substituted by OH, NH.sub.2, alkyl, alkoxy or NO.sub.2 ;R.sub.1 and R.sub.2 denote alkyl groups or together form a methylene or ethylene group which is optionally substituted by one or more alkyl groups, and R.sub.2 denotes hydrogen or COOH, in the presence of an oxidizing medium and of an enzyme with (per)oxidizing activity or of a compound which has a similar activity, and to powders which make use of them and to their cosmetic use.

Abstract: The invention relates to a product in powder form consisting of organic or inorganic particles having a lamellar structure, having a size of less than 50 microns and containing at least one synthetic melanotic pigment formed in situ by oxidation of an indole compound, and to its use for the protection of the human epidermis, in make-up products and for dyeing hair.

Abstract: 5-Substituted ortho-aminophenols of formula: ##STR1## in which: R.sub.1 denotes a hydrogen atom, an alkyl radical having 1 to 4 carbon atoms or a hydroxyalkyl radical having 1 to 4 carbon atoms; andR.sub.2 denotes, independently of R.sub.1, an alkyl radical having 1 to 4 carbon atoms, an alkoxy radical having 1 to 4 carbon atoms or a benzyl radical;the addition salts with an acid and the phenates, anddyeing composition containing a compound of formula (I) or a salt or a phenate of such a compound.The 5-substituted ortho-aminophenols enable hair to be dyed in a rich spectrum of hues having good durability.

Abstract: Use for dyeing keratinous fibres, and especially human hair, on a compound corresponding to the formula: ##STR1## in which X denotes a bromine or chlorine atom.