The present invention relates to a process for treating, in particular for dyeing, keratin fibres such as hair, comprising the
application of two compositions in two subsequent steps, the first composition comprising at least one indigo-producing plant and the
second one comprising acacia concinna. It is also directed to a multicompartment
device or “kit”.
In the field of dyeing keratin fibres, in particular human
keratin fibres such as hair, several processes may be used.
15 A first process for dyeing human keratin fibres implies dye
compositions containing oxidation dye precursors, generally known as
oxidation bases. These oxidation bases are colourless or weakly
coloured compounds, which, when combined with oxidizing products,
may give rise to coloured compounds via a process of oxidative
20 condensation.
The shades obtained with these oxidation bases can be modified
by combining them with couplers or coloration modifiers. The variety
of molecules used as oxidation bases and couplers allows a wide range
of colours to be obtained.
25 A second process for dyeing human keratin fibres is known as
direct dyeing or semi-permanent dyeing. It comprises the application
of direct dyes, which are coloured and colouring molecules that have
affinity for fibres. Given the nature of the molecules used, they tend
rather to remain on the surface of the fibre and penetrate relatively
30 little into the fibre, when compared with the small molecules of
oxidation dye precursors. The main advantages of this type of dyeing
are that it does not require any oxidizing agent, which limits the
degradation of the fibres.
2
The first hair dyes were semi-permanent. One of the best
known natural dyes is that derived from the henna plant. Henna is still
used in feminine beauty enhancement for colouring the hair, the nails
or the skin, as well as for dyeing leather, silk and wool. It is also used
5 traditionally for various important events, celebrations and beliefs.
This dye affords an orange-red coloration on grey hair, and a
"warm" i.e. coppery to red colour on chestnut-brown hair.
Another well-known natural dye is indigo. (see Ullmann's
Encyclopedia of Industrial Chemistry, Hair preparation, point 5.2.3,
10 2006 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim;
10.1002/14356007.a12 571.pub2). Indigo continues to be used for
feminine beauty enhancement by dyeing the hair or the nails, or for
dyeing fabrics (jeans), leather, silk, wool, etc. Indigo [482-89-3] is a
natural dye, originating in particular from the indigo plant, and having
15 the empirical formula: C16H10N2O2; and having the structure:
Indigo is derived from indican and may be prepared from
various plants known as indigo-producing plants such as Indigofera
20 tinctoria, Indigo suffruticosa, Isatis tinctoria, etc. (see Kirk-Othmer
Encyclopedia of Chemical Technology, updated on 17/04/2009, DOI:
10.1002/0471238961.0425051903150618.a01.pub2). The indigoproducing
plants are generally chopped and soaked in hot water,
heated, fermented and oxidized in the open air to liberate the purple-
25 blue coloured indigo (see Chem. Rev. 2011, 111, 2537-2561, p. 2537-
2561). Indigo is the result of the fermentation, in the presence of β-
glucosidases, and then oxidization of indican (glycosyl precursor). The
indigo molecule is insoluble in water.
However, the dyeing processes using those natural dyes result
30 in colors which do not satisfy the people. In particular, the use of
henne leads to an orange to copper red colour instead of black or
3
brown which are the colour requirement of the people. Also when
indigo is used, a blue color is obtained and the color progresses over
time.
Further, at the time of the application, the mixture of henna
5 and indigo results in a green color. Said color progresses to achieve
the brown color in about seven days, which is the color desired by a
consumer.
There is thus a real need to develop a new process for treating,
more particularly for dyeing, keratin fibres, preferably hair, with
10 natural dyes, which provides a stable, more homogeneous and
chromatic brown colorations from the root to the end of said fibres,
from the time of the application.
The Applicant has now discovered that these aims and others
could be achieved by means of a process for treating keratin fibres
15 comprising at least two subsequent steps, a first step comprising the
application of a composition which comprises one or more indigoproducing
plants and a second step comprising the application of a
composition which comprises acacia concinna.
This process allows obtaining a stable brown shade from the
20 time of application (T0) and thus avoids a color progression from
green to brown over several days.
Further it does not compromise the integrity of the hair and the
obtained color has a good shampoo-washing resistance.
Therefore, a subject-matter of the present invention is directed
25 to a process for treating keratin fibres comprising the following steps
which consist in:
(i) mixing composition (A) which comprises one or more indigoproducing
plants and optionally one or more henna plant
powder(s), with water, leading to composition (A’),
30 (ii) applying composition (A’) to keratin fibres, and in
(iii) applying composition (B) comprising acacia concinna.
The present invention also relates to a multi-compartment
device or "kit" comprising a first compartment containing composition
4
(A) or (A’) of the invention, and a second compartment containing
composition (B) of the invention, preferably in the form of a gel.
Another subject-matter of the invention is the use of the multicompartment
device or "kit" for dyeing keratin fibres, preferably
5 human keratin fibres such as hair.
Other subjects, characteristics, aspects and advantages of the
invention will emerge even more clearly on reading the description
and the example that follows.
In the text herein below, unless otherwise indicated, the limits
10 of a range of values are included in that range, for example in the
expressions "between" and "ranging from ... to ...".
Moreover, the expression "at least one" used in the present
description is equivalent to the expression "one or more".
According to the invention, the process for treating keratin
15 fibres, in particular human keratin fibres such as hair, comprises the
following steps consisting in:
(i) mixing composition (A) which comprises one or more indigoproducing
plants and optionally one or more henna plant powders,
with water, leading to composition (A’),
20 (ii) applying composition (A’) to keratin fibres, and in
(iii) applying composition (B) comprising acacia concinna.
An optional step of rinsing out composition (A’) with water
may be carried out after step (ii) and before step (iii).
25 Indigo-producing plant(s)
As indigo-producing plants comprised in composition (A)
and/or (A’), mention may be made of numerous species derived from
the following genera:
- Indigofera such as Indigofera tinctoria, Indigo suffraticosa,
30 Indigofera articulata, Indigofera arrecta, Indigofera
gerardiana, Indigofera argenta, Indigofera indica, Indigofera
longiracemosa;
- Isatis such as Isatis tinctoria;
5
- Polygonum or Persicaria such as Polygonum tinctorium
(Persicaria tinctoria);
- Wrightia such as Wrightia tinctoria;
- Calanthe such as Calanthe veratrifolia; and
5 - Baphicacanthus such as Baphicacanthus cusia.
Preferably, the indigo-producing plant is of the genus
Indigofera and more particularly is Indigofera tinctoria.
Use may be made of all or part (in particular the leaves
especially for Indigofera tinctoria) of the indigo-producing plant.
10 The indigo-producing plant powder may be screened to obtain
particles with upper limit sizes corresponding to the orifices or mesh
sizes of the screen particularly between 35 and 80 mesh (US).
Indigo-producing plants used in the invention are preferably in
the form of powder, and better still of particles.
15 According to a one embodiment of the invention, the size of the
indigo-producing plant powder particles is fine. In particular, a
particle size of less than or equal to 500 \xm is intended.
Preferentially, the powder consists of fine particles with sizes ranging
from 10 to 300 \xm and even more preferably from 50 to 200 \xm.
20 It is understood that the said indigo-producing plant particles
preferentially have a moisture content of between 0 and 10% by weight
relative to the total weight of the powders.
Preferably, the at least one indigo-producing plant is in the
form of powder, more particularly in the form of fine particles.
25 Preferably its amount is at least 5% by weight, relative to the total
weight of composition (A) or (A’). More preferably it ranges from 5%
to 90% by weight, more preferably from 10% to 85% by weight, or
even more preferably from 15% to 80% by weight, relative to the total
weight of composition (A) or (A’).
30
Henna plant powders (s)
Composition (A) may further comprise one or more henna plant
powders.
6
According to the invention, the henna plant powder that may be
used therein is different from an extract. Specifically, an extract is a
product of maceration in solvents, generally organic solvents, whereas
the powder usable in the invention is a pure natural product
5 originating from henna, reduced by grinding or other mechanical
means, into fine particles.
Preferably henna powder is provided as fine particles.
The henna powder may be screened to obtain particles with
upper limit sizes corresponding to the orifices or mesh sizes of the
10 screen particularly between 35 and 80 mesh (US). Value can be
determined with classical method or analyzer known by one skilled in
the art. Especially the Malvern particle size analyzer, D10, D50 and
D90 can be used to determine both size and volume distribution.
According to one particular mode of the invention, the size of
15 the henna powder particles is fine i.e. particles sizes of less than or
equal to 500 um is more particularly intended. Preferentially, the
powder consists of fine particles with sizes ranging from 10 to 300 \xm
and more particularly from 50 to 200 \xm.
Value can be determined with classical method or analyzer
20 known by one skilled in the art. Especially the Malven particle size
analyzer, D10, D50 and D90 can be used to determine both size and
volume distribution.
The said henna particles preferentially have a moisture content
of between 0 and 10% by weight relative to the total weight of the
25 powders.
Preferably, the said henna particles are derived from henna
leaves.
The henna plant powder used in the present invention is
preferably red henna (Lawsonia inermis, alba).
30 Red henna consists of leaves of shrubs of the genus Lawsonia
from the family of Lythraceae, which is based on the principle of
dyeing with the active agent lawsone: 2-hydroxy-1,4-naphthoquinone.
Lawsone [83-72-7] (CI Natural Orange 6 ; CI 75420), also known as
isojuglone, may be found in henna shrubs (Lawsonia alba, Lawsonia
7
inermis) ("Dyes, Natural", Kirk-Othmer Encyclopedia of Chemical
Technology, "Henna" Encyclopedia Britannica).
According to one embodiment of the invention, the one or more
henna plant powders are decontaminated.
5 By “decontaminated” is meant that henna has been cleansed to
remove contaminants such as micro-organisms.
The number of microorganisms is on average between 105 and
107 microorganisms per gram of powder or of leaves before
decontamination.
10 Any process known to those skilled in the art may be used with
the condition that the number of microbes has been reduced, i.e. by a
factor of 10² to 106, that is to say preferably between 99.9 and
99.99999%.
The term "micro-organisms" includes in particular fungi,
15 moulds, spores and bacteria.
Examples of decontamination method are hot air drying,
microwave, dry heat, steam sterilization, ethanol flotation and
irradiation.
When the henna plant powder(s) is(are) present in composition
20 (A), its amount ranges more preferably from 3% to 90% by weight,
even more preferably from 4% to 80% by weight, or more particularly
from 5% to 70% by weight, and better still from 35 % to 65% by
weight, relative to the total weight of composition (A) or (A’).
25 Preferably, composition (A) is first made by mixing one or
more indigo-producing plants and the optional one or more henna
plant powder(s).
The composition (A) is then diluted with water, preferably
warm water, resulting in composition (A’) in step (i) of the process of
30 the invention. In other terms, composition (A’) is the mixture of
composition (A) with water.
By “warm water” is meant water at a temperature below 60°C,
in particular ranging from 25°C to 55°C.
8
Preferably, composition (A) is diluted in water in a weight
ratio composition (A)/water ranging from 1:1 to 1:4 in step (i) .
Further, composition (A’), preferably in the form of a paste, is
applied to the keratin fibres in step (ii) of the process of the invention.
5
Acacia concinna
Step (iii) of the process of the invention consists of the
application of composition (B) comprising acacia concinna (or
shikakai).
10 Acacia concinna (Shikakai) is a climbing shrub native to Asia, common
in the warm plains of central and south India. The pods of this plant are
rich in saponins which are foam forming substances. Acacia concinna is
known in Ayurvedic medicine as Shikakai. These dried fruits are used to
manufacture in herbal products and shampoo. For centuries the people
15 who have had access to Acacia concinna tree have used its pod-like fruit
to clean their hair
Preferably, the acacia concinna is present in an amount ranging
from 2% to 15% by weight, more preferably from 8% to 12% by
weight, or even more preferably 10% by weight, relative to the total
20 weight of composition (B).
Thickener(s)
Composition (B) may further comprise one or more organic
thickeners.
25 The organic thickeners may be chosen from fatty acid amides
such as coconut monoethanolamide or diethanolamide, oxyethylenated
carboxylic acid monoethanolamide alkyl ether.
The organic thickeners may also be chosen from polymeric
thickeners.
30 The term "polymeric thickener” is understood to mean, within
the meaning of the present invention, a polymer capable, by its
presence, of increasing the viscosity of an aqueous composition into
which it is introduced by at least 50 centipoises at 25°C and at a shear
rate of 1 s-1. Preferably, the solution obtained by dissolving the
9
thickening polymer at 1% by weight in water exhibits a viscosity at
25°C and at a shear rate of 1 s- 1 which is greater than 100 centipoises.
These viscosities can be measured using in particular viscometers or
rheometers having cone-plate geometry.
5 The polymeric thickeners may be chosen from cellulose-base
thickeners, guar gum and derivatives thereof, gums of microbial
origin, acrylic acid or 2-acrylamido-2-methylpropane sulfonic acid
crosslinked homopolymers, associative polymers and mixtures thereof.
The term "associative polymers” is understood to mean, within
10 the meaning of the present invention, water soluble or water
dispersible polymers that are capable, in an aqueous medium, of
reversibly associating with each other or with other molecules. The
chemical structure of the polymers comprises at least one hydrophilic
region and at least one hydrophobic region wherein the hydrophobic
15 region(s) are alkyl or alkenyl group(s) comprising from 8 to 30 carbon
atoms.
Non-limitative examples of cellulose-base thickeners include
hydroxyethylcellulose, hydroxypropylcellulose and
carboxymethylcellulose. Non-limitative examples of guar gum and
20 derivatives thereof include hydroxypropyl guar. Non-limitative
examples of gums of microbial origin include xanthan gum and
scleroglucan gum.
Particularly preferred polymeric thickeners are acrylic acid
crosslinked homopolymers. Even more preferred polymeric thickeners
25 are acrylic acid homopolymers crosslinked with allyl su crose or allyl
pentaerythritol. Examples of such polymers include Carbopol ® 980
sold by the company Lubrizol.
When organic thickener(s) is(are) present in composition (B),
its(their) amount ranges particularly from 0.1% to 5% by weight, more
30 particularly from 0.5% to 4% by weight, and more preferentially from
1% to 4% by weight relative to the total weight of composition (B).
According to one embodiment, composition (B) is in the form
of a gel. Gels are typically defined as substantially dilute cross-linked
systems, which exhibit no flow when in the steady-state. Gels are
10
mostly liquid, but they behave like solids due to a three-dimensional
cross-linked network within the liquid.
Surfactant(s)
5 Composition(s) (A) and/or (A’) and/or (B) according to the
present invention may further comprise one or more surfactants, such
as anionic, cationic, nonionic, amphoteric or zwitterionic surfactants
or mixtures thereof, and preferably chosen from non-ionic surfactants.
Examples of preferred non-ionic surfactants are
10 polyalkoxylated fatty alcohols, wherein the fatty chain, which is
saturated or insaturated, is in the C 10-C50 range, preferably in the C12-
C40 range, more preferably in the C 16 to C30 range, these compounds
having in their structure from 1 to 100, in particular 1 to 50, better
from 2 to 30 alkoxy groups. The alkoxy groups are selected from the
15 group consisting of C 2-C6 oxides and their mixtures, with ethylene
oxide, propylene oxide, and their mixtures being the preferred
alkoxides. The alkyl chain may be linear, branched, saturated, or
unsaturated. Of these particular non-ionic surfactants, polyethoxylated
fatty alcohols such as oleth-10 and oleth-20, are more preferred.
20 When surfactant(s) is(are) present, its(their) amount ranges
particularly from 0.5% to 10% by weight, more particularly from 2%
to 8% by weight, and more preferentially from 4% to 6% by weight
relative to the total weight of composition (A) or to the total weight of
composition (B).
25
Solvent(s)
Composition (B) preferably comprises water.
Composition (A) and/or (A’) and/or (B) according to the
present invention may further comprise one or more organic
30 solvent(s).
Examples of organic solvents that may be mentioned include
linear or branched C 2-C4 alkanols, such as ethanol and isopropanol;
glycerol; polyols and polyol ethers, for instance 2-butoxyethanol,
propylene glycol, dipropylene glycol, propylene glycol monomethyl
11
ether, diethylene glycol monoethyl ether and diethylene glycol
monomethyl ether; and also aromatic alcohols or ethers, for instance
benzyl alcohol or phenoxyethanol, and mixtures thereof.
When they are present, the amount of organic solvents usually
5 ranges from 0.5% to 20% by weight, and preferably from 1% to 10%
by weight relative to the total weight of composition (A) or to the total
weight of composition (A’) or to the total weight of composition (B).
Optional adjuvant(s)
10 Composition(s) (A) and/or (A’) and/or (B) may also contain
various adjuvants conventionally used in hair dye compositions,
selected from anionic, cationic, nonionic, amphoteric or zwitterionic
polymers or mixtures thereof, mineral thickeners, antioxidants,
penetrants, sequestrants, fragrances, buffers, dispersants, conditioning
15 agents, film-forming agents, preserving agents, opacifiers, and
mixtures thereof.
The above adjuvants are generally present in an amount for
each of them of between 0.01% and 40% by weight, and preferably
between 0.1% and 20% by weight relative to the total weight of
20 composition (A) or to the total weight of composition (A’) or to the
total weight of composition (B) .
Needless to say, a person skilled in the art will take care to
select this or these optional adjuvant(s) such that the advantageous
properties intrinsically associated with the composition that are useful
25 in the dyeing process in accordance with the invention are not, or are
not substantially, adversely affected by the envisaged addition(s).
Process for treating keratin fibres
The process for treating, preferably for dyeing, keratin fibres,
30 and in particular human keratin fibres such as hair, comprises the
application of composition (A’) as described above, and composition
(B) as described previously, successively applied on said keratin
fibres.
12
In other words, composition (A’) is applied on said keratin
fibres, before the application of composition (B).
More particularly, each composition is applied as a layer on
said keratin fibres. The process allows dyeing by layering.
5 In step (i), composition (A) is diluted with water, preferably
warm water. Composition (A’) is thus obtained.
In particular, composition (A) is diluted in water in a weight
ratio composition (A)/water ranging from 1:1 to 1:4.
In step (ii) composition (A’) may be applied on wet or on dry
10 keratin fibres.
After an optional leave-on-time, composition (A’) may be
rinsed off with water prior to the application of composition (B).
In step (iii), the application temperature for composition (B)
ranges from room temperature (15 to 25°C) to 80°C and more
15 particularly from 15 to 55°C.
Following the application of composition (B), the keratin fibres
are optionally rinsed with water, before being dried or left to dry.
The leave-on-time of composition (A’) on the keratin fibres
may range from 5 to 120 minutes, preferably from 10 to 90 minutes,
20 and more preferably from 15 to 60 minutes.
The leave-on-time of composition (B) on the keratin fibres may
range from few seconds to 60 minutes, preferably from 5 seconds to 40
minutes, and more preferably from 10 seconds to 30 minutes.
In a preferred embodiment, the leave-on-time of composition
25 (A’) on the keratin fibres may range from 15 to 60 min and the leaveon-
time of composition (B) on the keratin fibres may range from 10
seconds to 30 minutes.
According to a particularly preferred embodiment; the process
allows dyeing keratin fibres, in particular human keratin fibres, for
30 example hair.
The process according to the invention has the advantage of
dyeing keratin fibres, especially human keratin fibres, with intense,
chromatic colorations that are resistant to washing, and that are
moreover long-lasting, without impairing the said fibres. Furthermore,
13
the colorations obtained using the process of the invention gives
homogenous colors from the root to the end of a fibre which
corresponds to a little coloration selectivity.
The treated keratin fibres have a very pleasant cosmetic aspect,
5 and their integrity is respected.
Also, the dyeing processes according to the invention make it
possible to obtain aesthetic colorations rapidly after application.
Multi-compartment device or “kit”:
10 Another subject-matter of the invention is a multi-compartment
device or "kit" comprising a first compartment containin g composition
(A) or (A’) as defined above, and a second compartment containing
composition (B) as defined above. Preferably, composition (B) is in
the form of gel in the second compartment.
15 Said device is used for dyeing keratin fibres, and in particular
human keratin fibres such as hair.
The example that follows serves to illustrate the invention
without, however, being limiting in nature.
20
EXAMPLES
The following compositions B1 to B4 were prepared with the
following ingredients indicated in the table below. The amounts
indicated in the table are expressed in grams of product.
25
Ingredients
Acacia
concinna fruit
extract (98%
of A.M.)1
Carbomer
(98% of
A.M.)2
Water
B 1
2
4
94
B 2
5
4
91
B 3
10
4
86
B 4
15
4
81
14
1 sold under the name Acacia concinna (Shikakai) extract dry powder by
the company Chemiloids Life Sciences Pvt. Ltd.
2 sold under the name Carbopol® 980 by the company Lubrizol.
5 Composition (A’) was prepared by mixing 5 g of Indigofera
tinctoria powder and 15 ml of water at 50°C in a bowl. A uniform
paste was obtained.
Composition (A’) was applied to 1 g of 90% gray hair lock
uniformly in specially designed hot plate and left for 60 minutes at
10 35°C.
Composition (A’) was then washed out with water.
Then 5 g of each of the compositions B1 to B4 were applied
uniformly in specially designed hot plate and left for 30 minutes at
35°C.
15 The hair lock was washed with water thoroughly and then dried
by blowing with a hair dryer.
Measurements
The evaluation of the coloration has been read on a
20 spectrocolorimeter (Minolta CM2600d, illuminant D65, angle 10°, SCI
values) for the L*, a*, b* colorimetric measurements. In this L*, a*,
b* system, L* represents the intensity of the color, a* indicates the
green/red color axis and b* indicates the blue/yellow color axis. The
lower the value of L, the darker or more intense the color. The higher
25 the value of a*, the redder the shade; the higher the value of b*, the
yellower the shade. The variation in coloring between the colored
locks of natural white hair (NW) which is untreated (control) and after
treatment or coloration are defined by AE*, corresponding to the
colour uptake on keratin fibers, according to the following equation:
ΔE*=>/(L* -Lo
*)2+(a*-ao*)2+(b*-bo*)2
30
In this equation, L*, a* and b* represent the values measured
after dyeing 90% gray hairs locks and L0*, a0* and b0* represent the
values measured for the untreated 90% gray hairs locks.
15
The greater the value of AE*, the greater the difference in color
between the control locks and the dyed locks and the greater colour
uptake is.
Example
1
2
3
4
Description
A’ + B 1
A’ + B2
A’ + B3
A’ + B4
L*
34.79
33.92
35.16
35.69
a*
3.83
6.88
8.92
11.5
b*
1.41
4.17
11.08
13.93
ΔE*
30.77
30.99
27.38
28.95
Conclusions
The process according to the present invention which requires
the application of a composition comprising acacia concinna on top of
10 a composition comprising Indigofera tinctoria, helps to mask the green
color. In particular, when composition B3 is used, a dark brown shade
is obtained since the L*, a*, b* values are in the range of L* = 30-38,
a* = 2-10 and b * = 5-15.

CLAIMS
1. Process for treating keratin fibres, in particular human
keratin fibres such as hair, comprising the following steps consisting
in:
5 (i) mixing composition (A) which comprises one or more indigoproducing
plant(s) and optionally one or more henna plant
powder(s), with water, leading to composition (A’),
(ii) applying composition (A’) to keratin fibres, and in
(iii) applying composition (B) comprising acacia concinna.
10 2. Process according to claim 1, wherein the indigo-producing
plant(s) is(are) derived from the following genera:
- Indigofera such as Indigofera tinctoria, Indigo suffraticosa,
Indigofera articulata, Indigofera arrecta, Indigofera gerardiana,
Indigofera argenta, Indigofera indica, Indigofera
15 longiracemosa;
- Isatis such as Isatis tinctoria;
- Polygonum or Persicaria such as Polygonum tinctorium
(Persicaria tinctoria);
- Wrightia such as Wrightia tinctoria;
20 - Calanthe such as Calanthe veratrifolia; and
- Baphicacanthus such as Baphicacanthus cusia;
preferably, the indigo-producing plant(s) is(are) of the genus
Indigofera and more particularly is Indigofera tinctoria.
3. Process according to claim 1 or 2, wherein the indigo-
25 producing plant(s) is(are) in the form of fine particles, and preferably
present in an amount of at least 5% by weight, more preferably in an
amount ranging from 5% to 90% by weight, and even more preferably
from 10% to 85% by weight relative to the total weight of composition
(A) or (A’).
30 4. Process according to any one of the preceding claims,
wherein the henna plant powder is chosen from red henna powder of
Lawsonia, preferably, the henna is derived from henna leaves.
17
5. Process according to any one of the preceding claims,
wherein the henna plant powder is in the form of fine particles,
preferably having sizes of less than or equal to 500 [im, more
preferentially ranging from 10 to 300 [im and even more particularly
5 from 50 to 200 [im.
6. Process according to any one of the preceding claims,
wherein the henna plant powder(s) is(are) present in an amount
ranging from 3% to 90% by weight, and even more particularly from
4% to 80% by weight, relative to the total weight of composition (A)
10 or (A’).
7. Process according to any one of the preceding claims,
wherein composition (A) is diluted in water in a weight ratio
composition (A)/water ranging from 1:1 to 1:4 in step (i).
8. Process according to any one of the preceding claims,
15 wherein the acacia concinna is present in an amount ranging from 2%
to 15% by weight, more preferably from 8% to 12% by weight, or even
more preferably 10% by weight, relative to the total weight of
composition (B).
9. Process according to any one of the preceding claims,
20 wherein composition (B) further comprise one or more organic
thickeners.
10. Process according to claim 9, wherein the one or more
organic thickener(s) is(are) present in an amount ranging from 0.1% to
5% by weight, more particularly from 0.5% to 4% by weight, and more
25 preferentially from 1% to 4% by weight relative to the total weight of
composition (B).
11. Process according to any one of the preceding claims,
wherein composition (B) in the form of a gel.
12. Multi-compartment device comprising a first compartment
30 containing composition (A) or (A’) as defined in any one of claims 1
to 5, and a second compartment containing composition (B) as defined
in any one of claims 1 and 8 to 11.
18
13. Use of the multi-compartment device according to claim 12,
for dyeing keratin fibres, in particular human keratin fibres such as
hair.