Oxidation dyeing composition containing at least one double and at least one single dyeing base, and dyeing process making use of such a composition

摘要

The invention relates to dyeing compositions for keratinous fibres, containing: (a) at least one dye precursor belonging to the family (A) of single bases selected from paraphenylenediamines; b) at least one dye precursor of the family (B) of doubles bases selected from N,N'-diphenylalkylenediamines; the dye precursors of the families (A) and (B) being selected so that the intensity of the colouration on dyed bleached hair (VD) and the intensity on dyed and permanent-waved bleached hair VDP is such that VD-VDP = 0+/-0.5, the value being determined according to MUNSELL's notation; the mole ratio between the single bases of the family (A) and the double bases of the family (B) being between 3 and 10.