Process for dyeing keratinous fibres with 2,6-dimethyl- 1,4-diaminobenzene and/or 2,3-dimethyl-1,4-diaminobenzene and/or 2,6-diethyl-1,4-diaminobenzene in an acid medium and compositions employed

摘要

Process for dyeing keratinous fibres, especially human keratinous fibres such as hair, which consists in applying on these fibres a composition containing, in a medium suitable for dyeing, at least 2,6-dimethyl-1,4-diaminobenzene and/or 2,3-dimethyl-1,4-diaminobenzene and/or 2,6-diethyl-1,4-diaminobenzene, as well as its salts and an oxidising agent, the pH of the composition applied on the fibres being below 7 and the aforementioned composition not containing iodide ions in sufficient amounts to oxidise the oxidation dye precursor.