Process for dyeing keratinous fibres with couplers and/or "rapid" oxidation dyes combined with an iodide and dyeing composition employed

A process for dyeing keratinous fibers comprising applying to said fibers at least one composition (A) comprising, in a medium suitable for dyeing said fibers, an oxidation dye, comprising (1) a mixture of (a) at least one coupler selected from the group consisting of a phenol, a metadiphenol, a meta-aminophenol, a meta-phenylenediamine, a monohydroxylated derivative of naphthalene, a polyhydroxylated derivative of naphthalene, a monohydroxylated derivative of aminonaphthalene, a polyhydroxylated derivative of aminonaphthalene, a pyrazolone and a benzomorpholine, and (b) at least one "rapid" oxidation dye capable of generating colored compounds by simple oxidation in air during an exposure time on said fibers of less than one hour and being selected from the group consisting of a trihydroxylated derivative of benzene, a diaminohydroxybenzene, an aminodihydroxybenzene, an aminohydroxybenzene, a triaminobenzene, a substituted 1,2-dihydroxybenzene, brazilin, haematoxyline and alkanet extract, or (2) at least one said "rapid" oxidation dye, said oxidation being present in an amount ranging from 0.01 to 10 percent by weight based on the total weight of said composition (A), in combination with iodide ions present in an amount ranging from 0.007 to 4 percent by weight, expressed as I.sup.- ions, relative to the total weight of said composition (A), and applying to said fibers composition (B) comprising, in a medium suitable for dyeing said fibers, hydrogen peroxide having a pH ranging from 2 to 12, the application of said composition (A) to said fibers preceding or following the application of said composition (B) to said fibers.