cosmetic composition, dye composition, keratin fiber dyeing process, dark keratin fiber lightening dyeing process, multi-compartment dyeing device or kit. The present invention is directed to a process for dyeing and / or bleaching keratin fibers such as hair using (i) at least one direct dye that has a protected disulfide, thiol or thiol function and (ii) at least one weakly fatty alcohol. or non-ethoxylated, iii) at least one cationic surfactant, iv) at least one alkaline agent, and v) at least one reducing agent. The present invention also relates to a composition comprising the ingredients i) to v) for the use of the combination of i), ii, iii), iv) and v) for the dyeing and / or bleaching of keratin fibers, and a kit. multi-compartment storage for ingredients i) to v). The dyeing process and the composition according to the present invention, in particular, give keratin fibers a long lasting color that is strong, chromatic and / or homogeneous, with or without the use of an oxidizing agent.
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