JP2020125273A - Dyeing method and hair dye kit - Google Patents

Abstract

To provide a dyeing method and a hair dye kit in which at least one dye selected from Green No. 204 and Green No. 3 is used.SOLUTION: The dyeing method for keratin fibers comprises: a step (A) of attaching a hair dye having a pH of 1.0 to 4.5 to keratin fibers, the hair dye containing at least one dye selected from Green No. 204 and Green No. 3; a washing step (B) of washing the keratin fibers subjected to the step (A); and a step (C) of attaching a post-treatment agent having a pH of 9.1 to 12.0 to the keratin fibers subjected to the washing step (B), the agent comprising at least one selected from organic alkali agents and carbonates.SELECTED DRAWING: None

Description

The present invention relates to a dyeing method and a hair dye kit.

An acidic hair dye is known as a coloring agent used for dyeing hair. Acidic hair dyes, which are also called acidic colors, hair manicures, color rinses, etc., have been popular in recent years because they have little damage to hair during dyeing, are simple and have excellent safety.

When an acidic hair dye is applied to hair, the dye having a negative charge and the keratin protein of the hair, which is positively charged by the acid, are ionically bonded to each other, so that the hair is dyed.
As the dye of the acidic hair dye, it is common to use a compound that is originally chemically synthesized so as to have a color (for example, a tar dye specified by the Ministry of Health, Labor and Welfare). For example, among the dyes, Green No. 204 and Green No. 3 which are one of the tar dyes designated by the Ministry of Health, Labor and Welfare, change their color tone depending on pH, and exhibit characteristic colors. Green No. 204 has a strong fluorescent color of light yellow when it is acidic, and yellow when it is alkaline, and Green No. 3 shows a bright green color when it is acidic, and a blue color when it is alkaline.

Many techniques have been proposed as hair dyes (see, for example, Patent Documents 1 and 2).
In Patent Document 1, an organic acid, an inorganic acid and/or a salt thereof is blended, and a first agent adjusted to pH 1.5 to 4 and an acid dye are added to a second agent adjusted to pH 7 to 11. Disclosed is a two-component acidic hair dye consisting of and, and a hair dyeing method characterized by applying the first agent to the hair and then applying the second agent.

Patent Document 2 is a hair dye composition containing an acid dye and an acid, and contains one or more acid dyes selected from Green No. 204, Red No. 230(1) and Yellow No. 202(1). And, the hair dye composition is characterized in that the content of the acid dye is 0.1 to 15% with respect to the total amount of the acid dye in the hair dye composition.

JP, 2002-3350, A JP, 2003-73238, A

The present inventors have found that the strong yellow fluorescent color of green No. 204 and the blue color of green No. 3 in alkaline are characteristic of the color tone, and therefore, while maintaining this characteristic color tone, It was examined whether keratin fibers containing keratin protein could be dyed.

However, in the existing techniques such as the dyeing method of Patent Document 1 and the hair dye composition of Patent Document 2, characteristic color tones in alkalinity such as a strong fluorescent color of yellow of Green No. 204 and a blue color of Green No. 3 are used. Could not dye keratin fibers.

From this, the present invention provides a method for dyeing keratin fibers using at least one dye selected from Green No. 204 and Green No. 3, and a hair dye kit that can be used in the method. The challenge is to provide.

The present inventors have diligently studied to solve the above problems. As a result, they have found that a dyeing method and a hair dye kit having the following constitution can solve the above problems, and have completed the present invention.

The present invention is, for example, the following [1] to [6].
[1] A step (A) of attaching at least one dye selected from Green No. 204 and Green No. 3 and having a pH of 1.0 to 4.5 to the keratin fiber, and a step (A). The washing step (B) for washing the performed keratin fiber and the keratin fiber subjected to the washing step (B) include at least one selected from an organic alkaline agent and a carbonate, and have a pH of 9.1 to 12.0 A method for dyeing keratin fibers, which comprises a step (C) of attaching a post-treatment agent.

[2] The method for dyeing keratin fibers according to [1], wherein the hair dye contains 0.005 to 5 mass% of at least one dye selected from Green No. 204 and Green No. 3.
[3] The method for dyeing keratin fibers according to [1] or [2], wherein the organic alkaline agent and the carbonate are at least one selected from monoethanolamine, arginine, aminomethylpropanol, morpholine and sodium carbonate.

[4] The step (C) is a step of allowing the post-treatment agent to adhere and then leaving it to stand for 10 seconds to 10 minutes, and includes a washing step (D) of washing the keratin fibers subjected to the step (C). The method for dyeing keratin fibers according to any one of [1] to [3].

[5] The dyeing method according to any one of [1] to [4], wherein the keratin fiber is hair.
[6] A hair dye containing at least one dye selected from Green No. 204 and Green No. 3, having a pH of 1.0 to 4.5, and at least one selected from organic alkali agents and carbonates, and having a pH of And a post-treatment agent for 9.1 to 12.0.

In the dyeing method of the present invention, it is possible to dye the keratin fiber with a strong yellow fluorescent color of Green No. 204 and the keratin fiber with the blue color of Green No. 3, and the hair dye kit of the present invention is It can be used for dyeing methods.

Next, the dyeing method and the hair dye kit of the present invention will be specifically described.
<Dyeing method>
The method for dyeing keratin fibers of the present invention comprises a step of attaching a hair dye containing at least one dye selected from Green No. 204 and Green No. 3 and having a pH of 1.0 to 4.5 to keratin fibers (A). And a washing step (B) for washing the keratin fiber subjected to the step (A) and at least one selected from an organic alkaline agent and a carbonate for the keratin fiber subjected to the washing step (B). And a step (C) of attaching a post-treatment agent having a pH of 9.1 to 12.0.

In the method for dyeing keratin fibers of the present invention, in order to attach the hair dye or the post-treatment agent to the keratin fibers, for example, applying a hair dye or a post-treatment agent to the keratin fibers, or the keratin fibers to the hair dye or post-treatment It suffices if it is dipped in the agent, etc., as long as it adheres uniformly.
Hereinafter, the keratin fibers to be dyed by the dyeing method of the present invention, the hair dye used in the dyeing method and the like will be described, and then each step will be described.

<Keratin fiber>
In the present invention, the keratin fiber refers to a fiber containing a keratin protein. Specific examples thereof include hair, goat hair, wool, dog hair, and cat hair. Hair includes wigs and extensions in which hair is used.

In the keratin fiber dyeing method of the present invention, as keratin fibers, goat hair and hair are preferable, and hair is more preferable.
When the keratin fiber used in the present invention is a fiber other than white such as hair, from the viewpoint of dyeing the fiber with a color tone derived from Green No. 204 and/or Green No. 3, before the step (A). It is also preferred to decolorize the keratin fibers.

<Hair dye>
The hair dye used in the step (A) contains at least one dye selected from Green No. 204 and Green No. 3, and has a pH of 1.0 to 4.5.

The hair dye preferably contains 0.005 to 5 mass% of at least one dye selected from Green No. 204 and Green No. 3, more preferably 0.01 to 3 mass%, and 0.2 to 1. Most preferably, it contains 0% by mass.

When the amount of at least one dye selected from Green No. 204 and Green No. 3 is less than 0.005% by mass, the dyeing may be too thin to develop a color. When the amount of at least one dye selected from Green No. 204 and Green No. 3 exceeds 5% by mass, the dyeing may not be deep. If the dosage form is cream or gel, the dosage form may not be maintained.

The hair dye preferably has a pH at 25° C. of 1.0 to 4.0, more preferably 1.5 to 3.5. The method for measuring the pH is not particularly limited, and a general method for measuring the pH (for example, the glass electrode method) may be used under appropriate measurement conditions.

The hair dye may contain an acidic component so as to have the above-mentioned pH. As the acidic component, for example, hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, acetic acid, citric acid, tartaric acid, propionic acid, lactic acid, salicylic acid, glycolic acid, succinic acid, malic acid, butyric acid, levulinic acid, maleic acid, phthalic acid, Examples include tartaric acid. As the acidic component, lactic acid, glycolic acid, succinic acid, malic acid and levulinic acid are preferable. The acidic component may be used as a solution such as an aqueous solution, and for example, 90% lactic acid can be used as lactic acid. The acidic components may be used alone or in combination of two or more.

Since the inorganic acid is inferior in dyeability to the organic acid, it is preferable not to include the inorganic acid as an acidic component.
It is usually preferable to attach the hair dye to dry keratin fibers.

<dye>
In the present invention, the compound used for coloring the keratin fiber is referred to as a dye.
The hair dye used in the present invention contains at least one dye selected from Green No. 204 and Green No. 3. Green No. 204 and Green No. 3 are tar dyes described in the Ministerial Ordinance (Ministry of Health and Welfare Ordinance No. 30 of 1941) that defines tar dyes that can be used for pharmaceuticals and the like.

Green No. 204 is an acid dye also called pyranine conc. The aqueous solution of Green No. 204 changes its color tone depending on pH and exhibits a characteristic color. When acidic, it exhibits a pale yellow color, and when alkaline, it exhibits a strong yellow fluorescent color and emits light when irradiated with ultraviolet rays.

Green No. 3 is an acid dye also called Fast Green FCF. The aqueous solution of Green No. 204 changes its color tone depending on pH and exhibits a characteristic color. It shows a bright green color when it is acidic, and it shows a blue color when it is alkaline.

The hair dye may contain an acid dye other than Green No. 204 and Green No. 3, an HC dye, and a basic dye, as long as the effects of the present invention are not impaired. Examples of the acid dyes include red 2, red 3, red 102, red 104 (1), red 105 (1), red 106, red 201, red 213, red 227, red 230(1), Red 230(2), Red 231, Red 232, Red 401, Red 502, Red 503, Red 504, Red 506, Orange 205, Orange 207, Orange No. 402, Yellow No. 4, Yellow No. 5, Yellow No. 202(1), Yellow No. 202(2), Yellow No. 203, Yellow No. 402, Yellow No. 403(1), Yellow No. 406, Yellow No. 407, Blue No. 1 No. 2, Blue No. 2, Blue No. 202, Blue No. 203, Blue No. 205, Green No. 201, Green No. 205, Green No. 401, Green No. 402, Brown No. 201, Black No. 401, Purple No. 401, HC Examples of dyes include HC blue 2, HC blue 6, HC blue 7, HC blue 8, HC orange 1, HC orange 2, HC orange 3, HC red 1, HC red 3, HC red 7, HC red 10, HC red 13, HC red 14, HC purple 1, HC purple 2, HC yellow 2, HC yellow 4, HC yellow 5, HC yellow 6, 1-amino-2-methyl-6-nitrobenzene, 1-amino-2- Methyl-4-methylaminobenzene, 4-(2-hydroxyethyl)amino-3-nitro-methylbenzene, 1-bis(β-hydroxyethyl)amino-3-nitro-4-amino, 1-amino-2- Benzene (β-hydroxypropylamino)benzene, 1-hydroxy-3-nitro-4-(3-hydroxypropylamino)benzene, 4-hydroxypropylamino-3-nitrophenol can be mentioned, and as the basic dye, For example, red 213, red 214, basic blue 7, basic blue 9, basic blue 26, basic blue 75, basic blue 99, basic red 2, basic red 22, basic red 51, Examples include basic red 76, basic yellow 57, basic yellow 87, basic orange 31, basic brown 16, basic brown 17, basic purple 3, basic purple 4, and basic purple 14. Among these, acid dyes and HC dyes are preferable from the viewpoints of being dyed with acidity and causing no precipitate or the like when used in combination with Green No. 204 and Green No. 3.

<Other ingredients>
The hair dye may contain other components as needed, as long as the effects of the present invention are not impaired. Other components include, for example, oily components (hydrocarbons, oils, waxes, higher alcohols, higher fatty acids, esters), thickeners, penetrants, humectants, surfactants (anionic Surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants), silicones, chelating agents, antioxidants, stabilizers, pH adjusters, protective agents, solvents, quenching Examples include agents, fragrances, preservatives, ultraviolet absorbers, propellants, plant extracts, herbal extracts, vitamins, and resins.

As other components, specifically, a (hydroxyethyl acrylate/acryloyldimethyltaurine Na) copolymer as a thickener, benzyl alcohol as a penetrant, ethanol and water as a solvent, and a pH adjuster such as the above-mentioned acidic component. Preferably, lactic acid (eg 90% lactic acid) can be used. Moreover, it is preferable to use ion-exchanged water as the water. The other components may be used alone or in combination of two or more.

<Formulation>
Examples of the dosage form of the hair dye include milk, cream, gel, and lotion, and specifically cream or gel is preferable. Further, the hair dye can also be used as a spray composition by using it together with a propellant. The dosage form of the hair dye can be prepared according to a conventional method for each dosage form.

<Post-treatment agent>
The post-treatment agent used in step (C) contains at least one selected from organic alkali agents and carbonates, and has a pH of 9.1 to 12.0.

In the post-treatment agent, organic alkali agents and carbonates include, for example, monoethanolamine, diethanolamine, arginine, lysine, morpholine, aminomethylpropanol, isopropanolamine, diisopropanolamine, 2-amino-2-methyl-1,3-. Propanediol, sodium carbonate, potassium carbonate may be mentioned. Among these, monoethanolamine, arginine, aminomethylpropanol, morpholine and sodium carbonate are preferable, and monoethanolamine is more preferable. Further, more specifically, 2-amino-2-methyl-1-propanol can be used as the aminomethyl propanol. The alkaline components may be used alone or in combination of two or more.

Since the inorganic alkaline agent is unlikely to remain in the keratin fibers, it is difficult to maintain the characteristic alkaline color tone of Green No. 204 and Green No. 3, so it is preferable not to include the inorganic alkaline agent as an alkaline component.

The post-treatment agent preferably contains 0.5 to 20% by mass of an organic alkaline agent and a carbonate, more preferably 1 to 10% by mass, and most preferably 1 to 8% by mass.
The post-treatment agent preferably has a pH at 25°C of pH 9.3 to 11.9, and more preferably pH 9.6 to 11.1. The method for measuring the pH is not particularly limited, and a general pH measuring method (for example, a glass electrode method) may be used for measurement under appropriate measuring conditions.

<Other ingredients>
The post-treatment agent may contain other components, if necessary, as long as the effects of the present invention are not impaired. Other components include, for example, oily components (hydrocarbons, oils, waxes, higher alcohols, higher fatty acids, esters), thickeners, penetrants, humectants, surfactants (anionic Surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants), silicones, chelating agents, antioxidants, stabilizers, pH adjusters, protective agents, solvents, quenching Examples include agents, fragrances, preservatives, ultraviolet absorbers, propellants, plant extracts, herbal extracts, vitamins, and resins.

As other components, specifically, water as a solvent and a pH adjuster can be used. As the pH adjuster, the above-mentioned acidic components, specifically lactic acid (for example, 90% lactic acid), phosphoric acid, citric acid, glycolic acid, levulinic acid, succinic acid, and malic acid can be used. Moreover, it is preferable to use ion-exchanged water as the water. The other components may be used alone or in combination of two or more.

<Formulation>
The form of the post-treatment agent is not limited, and examples thereof include liquid form, milk form, cream form, gel form, and lotion form. As the dosage form of the post-treatment agent, specifically, a liquid form can be used. The post-treatment agent can also be used as a spray composition and a foam composition by using it together with a propellant. The dosage form of the post-treatment agent can be prepared based on a conventional method for each dosage form.

<Process (A)>
The keratin fiber dyeing method of the present invention includes a step (A) of attaching a hair dye to the keratin fiber.

In the step (A), it is preferable that a sufficient amount of the hair dye is applied to the keratin fiber so that the hair is uniformly attached. For example, 0.5 to 20 g of the hair dye, preferably 0.5 to 1 g of the keratin fiber. Using 3 g, it can be applied uniformly.

Examples of the method of attaching the hair dye to the keratin fiber include a method of applying the hair dye to the keratin fiber and a method of immersing the keratin fiber in the hair dye. When the hair dye is applied to the keratin fibers, for example, 0.5 to 3 g of the hair dye can be used and uniformly applied to 1 g of the keratin fibers. When the keratin fibers are dipped in the hair dye, for example, 5 to 20 g of the hair dye can be used and uniformly attached to 1 g of the keratin fibers.

In the step (A), after the hair dye is attached, the hair dye can be optionally left at 20°C to 50°C for 10 seconds to 30 minutes. Since the dye easily penetrates into the keratin fiber, it is preferable to leave it at 20 to 50° C. for 15 to 30 minutes, more preferably at 45° C. for 15 minutes after the hair dye is attached.

<Washing step (B)>
The keratin fiber dyeing method of the present invention includes a washing step (B) of washing the keratin fiber subjected to the step (A).

The washing step (B) may be washing with water, and in order to sufficiently wash the hair dye from the keratin fiber, one containing a washing component such as shampoo (for example, an aqueous solution containing POE(3) lauryl ether sulfate) is used for keratin. The fibers may be washed. Alternatively, washing with water and washing with shampoo or the like may be combined. Further, when the keratin fiber is washed with a shampoo or the like containing a cleaning component, it is preferable to rinse the keratin fiber after that in order to remove the cleaning component.

In addition, in the keratin fiber dyeing method of the present invention, the step (C) is not performed after the step (A) of attaching the hair dye to the keratin fiber and without passing through the washing step (B). After the hair dye is applied to the keratin fibers, the post-treatment agent is continuously applied to the keratin fibers to obtain a strong yellow fluorescent color of green No. 204 and a blue color of green No. 3 obtained by the method for dyeing keratin fibers of the present invention. The obtained keratin fiber cannot be obtained.
In the method for dyeing keratin fibers of the present invention, it is preferable that after the step (B) and before the step (C), the water attached to the keratin fibers is lightly removed using a towel or the like.

<Process (C)>
The keratin fiber dyeing method of the present invention includes a step (C) of attaching a post-treatment agent to the keratin fiber subjected to the washing step (B).

In the step (C), it is preferable that a sufficient amount of the post-treatment agent is used to uniformly adhere to the keratin fiber, and for example, 0.5 to 20 g of the post-treatment agent is uniformly added to 1 g of the keratin fiber. Can be attached.

Examples of the method of attaching the post-treatment agent to the keratin fiber include a method of applying the post-treatment agent to the keratin fiber and a method of immersing the keratin fiber in the post-treatment agent. When the post-treatment agent is applied to the keratin fibers, for example, 0.5 to 3.0 g of the post-treatment agent can be used and uniformly attached to 1 g of the keratin fibers. When the keratin fiber is dipped in the post-treatment agent, for example, 5 to 20 g of the post-treatment agent can be used and uniformly attached to 1 g of the keratin fiber.

In the step (C), after the post-treatment agent is attached, it is possible to optionally leave it for 10 seconds to 10 minutes. Since step (C) is a step of sufficiently permeating the components of the post-treatment agent into the hair, it is preferable to leave it for 10 seconds to 5 minutes after step (C), and leave it for 30 seconds to 5 minutes. Is more preferable. The temperature at which the step (C) is performed is not particularly limited, but may be performed at 23 to 27°C, for example.

<Process (D)>
The keratin fiber dyeing method of the present invention may include a washing step (D) of washing the keratin fiber subjected to the step (C).

The washing step (D) can be performed in the same manner as the washing step (B) described above.
Further, it is preferable to dry the keratin fiber after the step (D) or after the step (C) when the step (D) is not included. When the keratin fiber is hair, the drying is preferably performed using a dryer.

<Hair dyeing kit>
The keratin fiber hair dye kit of the present invention comprises at least one dye selected from Green No. 204 and Green No. 3, and has a pH of 1.0 to 4.5, an organic alkali agent and a carbonate. The post-treatment agent contains at least one selected and has a pH of 9.1 to 12.0.

As the hair dye and the post-treatment agent, the hair dye and the post-treatment agent described in the method for dyeing keratin fibers of the present invention can be used.
The keratin fiber hair dye kit of the present invention is preferably used for carrying out the above-described keratin fiber dyeing method of the present invention.

<Use>
The keratin fiber dyeing method of the present invention can be performed on the entire keratin fiber or a predetermined portion of the keratin fiber. For example, it can be performed on all or part of a wig using keratin fibers, or on all or part of hair.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

<Preparation of hair dye and post-treatment>
A hair dye was prepared by mixing the components in the formulation shown in Table 1. Formulations A-1 and A-2 are formulations of the hair dye used in Examples, and Formulations A-3 and A-4 are formulations of the hair dye used in Comparative Examples. The numerical values of the formulations in the table represent the mass% of each component when the hair dye is 100 mass %.

A post-treatment agent was prepared by mixing the components in the formulation shown in Table 2. Formulations B-1 to B-10 are formulations of the hair dye used in Examples, and Formulations B-11 to B-14 are formulations of the hair dye used in Comparative Examples. The numerical values of the formulations in the table represent the mass% of each component when the post-treatment agent is 100 mass %.

The pH values in Tables 1 and 2 were measured using pH METER F-71 manufactured by HORIBA.
The following commercially available products were used as the components shown in Tables 1 and 2.
Green No. 204: Product name Green No. 204 (Konami Kasei Co., Ltd.)
Green No. 3: Product name Green No. 3 (Kinomi Kasei Co., Ltd.)
(Hydroxyethyl acrylate/acryloyl dimethyl taurine Na) copolymer: Product name Sepinob EMT-10 (SEPPIC)
Benzyl alcohol: Product name Benzyl alcohol (Tokyo Ohka Kogyo Co., Ltd.)
Ethanol: Product name 95% ethanol (Japan Synthetic Alcohol Co., Ltd.)
90% lactic acid: Product name Fermented lactic acid 90% (Purac)
Monoethanolamine: Product name Monoethanolamine (Nippon Shokubai Co., Ltd.)
NaOH: Product name Sodium hydroxide (Tokyo Ohka Kogyo Co., Ltd.)
Arginine: Product name L-Arginine (Junsei Kagaku Co., Ltd.)
Aminomethyl propanol: Product name AMP-Ultra PC1000 (Dow Chemical Japan Co., Ltd.)
Sodium carbonate: Product name Sodium carbonate (Daito Chemical Co., Ltd.)
Morpholine: Product name Morpholine (Japan Emulsifier Co., Ltd.)
89% phosphoric acid: Product name 89% phosphoric acid (Nippon Chemical Industry Co., Ltd.)

<Processing method 1>
<<Example 1>>
2 g of the hair dye of the formulation A-1 was applied to a hair bundle of 1 g of 10 cm goat hair, and the hair dye was left for 15 minutes in a thermostat at 45°C. Then, it was thoroughly washed with water, washed with a 10% aqueous solution of POE(3) lauryl ether sulfate, and then thoroughly rinsed.

After the water attached to the hair bundle of goat hair was lightly removed with a towel, the goat hair was dipped in the post-treatment agent for formulation B-1 whose pH had been measured in advance, and the hair was left at 25°C for 5 minutes. Then, it was thoroughly washed with water, washed with a 10% aqueous solution of POE(3) lauryl ether sulfate, rinsed thoroughly, and dried with a drier.

The color of the dyed goat's hair bundle was visually observed, and the dyeing method was evaluated according to the following criteria. Table 3 shows the evaluation results.
"Evaluation criteria"
When using Green No. 204 (formulations A-1 and A-3) A: Having a strong yellow fluorescent color X: Having a pale yellow When using Green No. 3 (formulations A-2 and A-4) A : Stained in blue ○: Stained in greenish blue ×: Stained in green

<<Examples 2 to 10>>
The post-treatment agent was dyed and evaluated in the same manner as in Example 1 except that the prescription agent shown in Table 3 was used. Table 3 shows the evaluation results.

<<Examples 11 to 20>>
The hair dye of Formula A-2 was used, and the post-treatment agent was dyed and evaluated in the same manner as in Example 1 except that the one described in Table 4 was used. Table 4 shows the evaluation results.

<<Comparative Examples 1 to 8>>
The hair dye and the post-treatment agent were dyed and evaluated in the same manner as in Example 1 except that the formulations shown in Table 5 were used. Table 5 shows the evaluation results.

<Processing method 2>
<<Examples 21 to 22>>
Dyeing and evaluation were carried out in the same manner as in Example 1 except that the hair dye and post-treatment agent shown in Table 6 were used, and goat hair was immersed in the post-treatment agent and left at 25° C. for 30 seconds. Table 6 shows the evaluation results.

<Processing method 3>
<<Comparative Examples 9 to 10>>
2 g of the hair dye of Formula A-3 in Comparative Example 9 and Formula A-4 in Comparative Example 10 was applied to a hair bundle of 1 g of 10 cm goat hair, and the hair dye was allowed to stand in a thermostat at 45° C. for 15 minutes. Then, it was thoroughly washed with water, washed with a 10% aqueous solution of POE(3) lauryl ether sulfate, rinsed thoroughly, and dried with a drier. No treatment of immersing goat hair in the post-treatment agent was performed.

The color of the dyed goat's hair bundle was visually observed, and the dyeing method was evaluated according to the same evaluation criteria as in Example 1. Table 7 shows the evaluation results.

The dyeing methods of Examples 1 to 22 all gave good results. Further, it can be seen from Examples 21 and 22 that good results were obtained even when the treatment time of the post-treatment agent was 30 seconds.
According to the method for dyeing keratin fibers of the present invention, it is possible to provide a method for dyeing keratin fibers with a strong yellow fluorescent color of green No. 204 and a staining method for dyeing blue with green No. 3.

In the dyeing method of Comparative Example 1, since the pH of the post-treatment agent for formulation B-11 was lower than that of the present invention, the color tone of Green No. 204 when dyed on keratin fibers became pale yellow.
In the dyeing method of Comparative Example 2, since the pH of the post-treatment agent for formulation B-12 was lower than that of the present invention, the color tone of Green No. 204 when dyed on keratin fibers became pale yellow.

In the dyeing method of Comparative Example 3, since the post-treatment agent for Formulation B-13 contains an inorganic alkaline agent, the color tone of Green No. 204 when dyed on keratin fibers became pale yellow.
In the dyeing method of Comparative Example 4, since the post-treatment agent for formulation B-14 contains an inorganic alkaline agent, the color tone of Green No. 204 when dyed on keratin fibers became pale yellow.

In the dyeing method of Comparative Example 5, since the pH of the post-treatment agent for formulation B-11 was lower than that of the present invention, the color tone of Green No. 3 when dyed on keratin fibers became green.
In the dyeing method of Comparative Example 6, since the pH of the post-treatment agent of formulation B-12 was lower than that of the present invention, the color tone of Green No. 3 when dyed on keratin fibers became green.

In the dyeing method of Comparative Example 7, since the post-treatment agent for formulation B-13 contains an inorganic alkaline agent, the color tone of green No. 3 when dyed on keratin fibers became green.
In the dyeing method of Comparative Example 8, since the post-treatment agent for formulation B-14 contained an inorganic alkaline agent, the color tone of Green No. 3 when dyed on keratin fibers became green.

In the dyeing method of Comparative Example 9, since the pH of the hair dye of Formulation A-3 was higher than that of the present invention, the color tone of Green No. 204 when dyed on keratin fibers became pale yellow. Further, since the hair dye of the formulation A-3 is considered to be a mixture of the hair dye used in the present invention and the post-treatment agent, it is necessary to attach the hair dye in a state where the hair dye and the post-treatment agent are not mixed. all right.

In the dyeing method of Comparative Example 10, since the pH of the hair dye of Formulation A-4 was higher than that of the present invention, the color tone of Green No. 3 when dyed on keratin fibers became green. Further, since the hair dye of Formula A-4 is considered to be a mixture of the hair dye used in the present invention and the post-treatment agent, it may be necessary to adhere the hair dye in a state where the hair dye and the post-treatment agent are not mixed. all right.

Claims (6)

A step (A) of adhering a hair dye having a pH of 1.0 to 4.5 to the keratin fiber, the step (A) containing at least one dye selected from Green No. 204 and Green No. 3;
A washing step (B) for washing the keratin fibers subjected to the step (A),
A step (C) of attaching at least one selected from an organic alkali agent and a carbonate to the keratin fiber subjected to the washing step (B) and having a pH of 9.1 to 12.0. including,
Method for dyeing keratin fiber. The method for dyeing keratin fibers according to claim 1, wherein the hair dye contains 0.005 to 5 mass% of at least one dye selected from Green No. 204 and Green No. 3. The method for dyeing keratin fibers according to claim 1, wherein the organic alkaline agent and the carbonate are at least one selected from monoethanolamine, arginine, aminomethylpropanol, morpholine, and sodium carbonate. The step (C) is a step of allowing the post-treatment agent to adhere and then leaving it to stand for 10 seconds to 10 minutes,
The method for dyeing keratin fibers according to any one of claims 1 to 3, comprising a washing step (D) of washing the keratin fibers subjected to the step (C). The dyeing method according to any one of claims 1 to 4, wherein the keratin fiber is hair. A hair dye containing at least one dye selected from Green No. 204 and Green No. 3, and having a pH of 1.0 to 4.5,
A hair dye kit for keratin fibers, which comprises at least one selected from organic alkali agents and carbonates, and a post-treatment agent having a pH of 9.1 to 12.0.