Hair-dyeing process involving protection of the scalp

Claim 1

In the process for coloring human living hair which comprises, in a first stage, applying to the skin a protective composition and thereafter, in a second stage, applying on the hair one or more dye or coloring compositions, the improvement for preventing contact between said skin and the dyestuff and/or dyestuff precursors wherein a composition containing a member selected from the group consisting of charcoal, carrageenate, a cosmetically acceptable polymer derived from polystyrene sulphonic acid having a molecular weight of 50,000 to 500,000, alumina, clay or aluminum phosphate or mixtures thereof in suspension or in solution in water, ethanol, isopropanol, polyethylene glycol, glycerol or their mixtures, said composition having a viscosity of 80 to 8,000 cps suitable for application on the scalp, or being in the form of a powder, said composition being applied in said first stage in a scalp protective effective amount, and in said second stage, applying on the hair one or more compositions, at least one of which contains either at least one oxidizable hair dye which is a dyestuff precursor of the ortho or para type, or a mixture thereof, a dyestuff precursor of the ortho or para type associated with a coupler which is a monophenol derivative, meta-dihydroxy benzene, meta-aminophenol, meta-diamine, heterocyclic compound derived from pyridine or from morpholine, pyrazolone or diketone compound or their salts, a diphenylamine or a rapid oxidation dyestuff capable of developing on contact with the hair, or a direct dyestuff which is a nitrobenzene derivative, an azo dyestuff, an anthraquinone dyestuff, an indophenol, indamine or indoaniline, said composition applied in the second stage remaining in contact with the hair during 10 to 40 minutes, and subsequently rinsing or rinsing and shampooing the treated hair.