Patent Interference No. 103,548
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 Eq 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.
15. A method according to claim 9, wherein composition (B) containing, at a
pH of between 2 and 10, a metal anion having a good affinity for keratin fibers
and comprising permanganate or dichromate is applied to the keratinous fibres
and, in a second step, the composition (A) is applied at a pH or between 4 and
10.
16. A method according to claim 15, wherein the permanganate or
dichromate is used in an anion molality of higher than 10-3 moles/1,000 g up to 1
mole/1,000 g and the compositions do not contain an organic agent having a
reducing effect on the anions.
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Last modified: November 3, 2007