Nondyeing composition containing a precursor and an oxidation reaction catalyst

The cosmetic composition as claimed in any one of the preceding claims, wherein the catalyst falls within the group consisting of metals and their cosmetically acceptable salts, and oxidative enzymes.

The cosmetic composition as claimed in one of the preceding claims, wherein the agent capable of polymerization is chosen from methyl 5,6-dihydroxy-indoline -l-isopropionate and 1-hydroxyethyl-4-hydroxy-indole.

The cosmetic composition as claimed in one of the preceding claims, which preferably contains from 0.001% to 20%, and still more preferably from 0.05% to 10% by weight of agent(s) capable of oxidative poly-merization relative to the total weight of said composition.

The cosmetic composition as claimed in one of the preceding claims, which preferably contains from 0.00001% to 5%, and still more preferably from 0.001% to 1% by weight of oxidation catalyst(s) relative to the total weight of said composition.

The cosmetic composition as claimed in one of the preceding claims, which comprises at least one oxidation reaction mediator.

The cosmetic composition as claimed in one of the preceding claims, which comprises at least one other agent chosen from the group consisting of nonionic, anionic, cationic or amphoteric surfactants, organic or inorganic thickeners, nonionic, anoinic, cationic or amphoteric polymers, exhibiting hair-styling properties or otherwise, linear or cyclic, volatile or nonvolatile silicones, which are organomodified or otherwise, vitamins or provitamins, and perfumes.