COMPOSITION FOR DYEING KERATIN FIBRES COMPRISING A DIRECT DYE BEARING A DISULFIDE/THIOL FUNCTION, A FATTY SUBSTANCE, AN ALKALINE AGENT AND A REDUCING AGENT

摘要

The invention relates to a process for dyeing and/or lightening keratin fibres such as the hair, using i) at least one direct dye bearing a disulfide, thiol or protected-thiol function and ii) at least 25% of one or more fatty substances, iii) at least one alkaline agent, and iv) at least one reducing agent. The invention also relates to a composition comprising the ingredients i) to iv), to the use of the combination of i), ii), iii) and iv) for the dyeing and/or lightening of keratin fibres, and to a multi-compartment kit comprising the ingredients i) to iv). The dyeing process and the composition according to the invention especially afford a long-lasting coloration on keratin fibres, which is strong, chromatic and/or homogeneous, with or without the use of an oxidizing agent.