Patent Interference No. 103,548
7. A method for dyeing keratinous fibres, in particular human keratinous
fibres, wherein at least one composition as defined in claim 4 is applied to these
fibres, this composition is kept in contact with the fibres for a period sufficient to
develop a colour, either in air or with the aid of an oxidizing system, and wherein
the fibres are then rinsed.
8. A method according to claim 7, wherein the colour is allowed to develop in
contact with air without adding an external oxidizing agent.
9. A method according to claim 7, wherein the at least one composition as
defined in claim 1 is identified as composition (A) and the colour is developed
with the aid of a chemical oxidizing system consisting of:
(i)iodide ions and hydrogen peroxide, the composition (A) additionally
containing, in this case, either (a) iodide ions or (b) hydrogen
peroxide and the application of the composition (A) being preceded or
followed by the application of a composition (B) which contains, in a medium
appropriate for dyeing, either:
(a) hydrogen peroxide at a pH of between 2 and 12 when the composition
(A) contains iodide ions, or
(b) iodide ions at a pH of between 3 and 11, when the composition (A)
contains hydrogen peroxide;
(ii) nitrite, the application of the composition (A) being followed by
the application of an aqueous composition (B) having an acid pH, the
composition (A) or the composition (B) containing at least one nitrite;
(iii) oxidant comprising hydrogen peroxide, periodic acid or a
water-soluble salt thereof, sodium hypochlorite, chloramine T,
chloramine B, potassium ferricyanide, silver oxide, Fenton's reagent, lead(IV)
oxide, caesium sulphate or ammonium persulphate; the oxidant being
present in the composition (A) or being applied simultaneously or
sequentially by means of a composition (B) containing it in a medium
appropriate for dyeing;
(iv)metal anions comprising permanganate or dichromate, the oxidising
agent being applied by means of an aqueous composition (B), at a pH of 2 to
10, before application of the composition (A);
(v)salt of a metal of groups 3 to 8 of the periodic table, the metal
salt being applied in a separate step by means of a composition (B)
containing the salt in a medium appropriate for dyeing;
(vi) rare-earth salt, the rare-earth salt being applied by means of a
composition containing the salt in a medium appropriate for dyeing, the
composition (B) being applied before or after the application of the
composition (B) being applied before or after the application of the
composition (A); and
(vii) a quinone derivative comprising an ortho- or para- benzoquinone, an
ortho- or para-benzoquinone monoimine or diimine, a 1,2- or 1,4-
naphthoquinone, an ortho- or para-benzoquinone sulphonimide, an ",T-
alkylenebis-1,4-benzoquinone or a 1,2- or 1,4-naphthoquinone monoimine or
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Last modified: November 3, 2007