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 the hair, consisting in applying to these fibres a composition containing, in a medium suitable for dyeing, at least 2,6- dimethyl-l,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 to the fibres being less than 7 and the said composition not containing iodide ions in a sufficient quantity to oxidise the oxidation dye precursor.