Patent Interference No. 103,548
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- or1,4-
naphthoquinone, an ortho- or para-benzoquinone sulphonimide, ",T-
alkylenebis-1,4-benzoquinone or a 1,2- or 1,4-naphthoquinone monoimine or
diimine, the 5,6-dihydroxyindoline of formula (I) and the quinone derivative
being selected such that the difference in redox potential )E between the
redox potential E1 of the 5,6-dihydroxyindoline of formula (I) determined at
pH 7 in a phosphate medium on a vitreous carbon electrode by means of
voltammetry and the redox potential E.sub.q of the quinone derivative
determined at pH 7 in a phosphate medium by polarography on a mercury
electrode relative to the saturated calomel electrode such that:
)E = Ei - Eq # 320 millivolts;
the composition (B) being applied before or after the application of the
composition (A).
10. A method according to claim 9, wherein composition (A) in
combination with iodide ions is applied to the keratinous fibres, the
application of the composition (A) being preceded or followed by the
application of the composition (B) which contains hydrogen peroxide in a medium
appropriate for dyeing.
11. A method according to claim 9, wherein at least one composition (A)
in combination with hydrogen peroxide and having a pH of between 2 and 7 is
applied to the keratinous fibres, the application of the composition (A) being
preceded or followed by the application of the composition (B) which contains
iodide ions in a medium appropriate for dyeing.
12. A method according to claim 10, wherein the iodide ions are present
in the composition (A) or (B) in a proportion of between 0.007 and 4% by weight,
expressed as I-ions, relative to the total weight of the
composition (A) or (B).
13. A method according to claim 9, wherein composition (A) is applied to the
keratinous fibres and an acid aqueous composition (B) is then applied, the
composition (A) or the composition (B) containing at least one nitrite comprising
alkali metal nitrite, alkaline-earth metal nitrite or ammonium nitrite or the nitrite of
any other cosmetically acceptable cation, an organic nitrite derivative or a nitrite
vector generating a nitrite of the type define above.
14. A method according to claim 13, wherein the nitrite is present in a
proportion of between 0.02 and 1 mole/liter.
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Last modified: November 3, 2007