The present disclosure relates to a process for preparing a Lawsonia inermis extract which is rich in Lawsone. It also relates to the extract which may be obtained by said process and to a composition comprising thereof. The disclosure also relates to a method for dying fibers, in particular keratin fibers.

The disclosure relates to a dye composition comprising a combination of two extracts of Lawsonia inermis and a method for preparing thereof. The disclosure also relates to the cosmetic use of said composition for dyeing keratin fibers. Finally, the disclosure relates to a cosmetic method for dyeing keratin fibers comprising the application of such a composition.

The disclosure relates to a dye composition comprising a combination of two extracts of Lawsonia inermis and a method for preparing thereof. The disclosure also relates to the cosmetic use of said composition for dyeing keratin fibers. Finally, the disclosure relates to a cosmetic method for dyeing keratin fibers comprising the application of such a composition.

An object of the present invention is to provide a gardenia blue pigment that can stably maintain the color tone even after heating under acidic conditions, and a method for producing the gardenia blue pigment. A gardenia blue pigment that can stably maintain the color tone even after heating under acidic conditions is obtained by carrying out the following first and second steps: the first step of reacting walnut peptide, bitter melon peptide, and/or soy peptide with genipin in a solvent without the supply of a gas containing oxygen; and the second step of treating the reaction solution obtained in the first step with the supply of a gas containing oxygen.

An object of the present invention is to provide a gardenia blue pigment that can stably maintain the color tone even after heating under acidic conditions, and a method for producing the gardenia blue pigment. A gardenia blue pigment that can stably maintain the color tone even after heating under acidic conditions is obtained by carrying out the following first and second steps: the first step of reacting walnut peptide, bitter melon peptide, and/or soy peptide with genipin in a solvent without the supply of a gas containing oxygen; and the second step of treating the reaction solution obtained in the first step with the supply of a gas containing oxygen.

The present disclosure relates to a natural dyeing method using shouliang yam rhizome, and more particularly to a natural dyeing method using shouliang yam rhizome, which prevents the discoloration of a naturally dyed fabric, is harmless to the human body, and exhibits excellent color development, excellent antibacterial activity, excellent deodorization, and excellent dyeing fastness such as friction fastness and light fastness.

The present disclosure relates to a natural dyeing method using shouliang yam rhizome, and more particularly to a natural dyeing method using shouliang yam rhizome, which prevents the discoloration of a naturally dyed fabric, is harmless to the human body, and exhibits excellent color development, excellent antibacterial activity, excellent deodorization, and excellent dyeing fastness such as friction fastness and light fastness.

The present disclosure relates to a natural dyeing method using fermented persimmon juice, and more particularly to a natural dyeing method using fermented persimmon juice, which prevents the discoloration of a naturally dyed fabric, is harmless to the human body, and exhibits excellent color development, excellent antibacterial activity, excellent deodorization, and excellent dyeing fastness such as friction fastness and light fastness.

The present disclosure relates to a natural dyeing method using fermented persimmon juice, and more particularly to a natural dyeing method using fermented persimmon juice, which prevents the discoloration of a naturally dyed fabric, is harmless to the human body, and exhibits excellent color development, excellent antibacterial activity, excellent deodorization, and excellent dyeing fastness such as friction fastness and light fastness.

Provided is an anthocyanin pigment composition having the following features: (A) an aqueous solution containing the composition and adjusted to pH of 3 with a citrate buffer (pH: 3.0) has a maximum absorption wavelength of 500 to 550 nm in the visible light region; (B) when a pigment-composition-containing aqueous solution containing the composition, 0.2 mass % citric acid, 20 mass % ethanol, and water is prepared so as to have a color value E.sup.10%.sub.1 cm of 10, 1 mL of the aqueous solution is sealed in a 20-mL vial, and the vial is stored at 50° C. for 5 days and further maintained at 40° C. for 30 minutes, the total amount of methyl mercaptan, dimethyl disulfide, and dimethyl trisulfide in the gas in the sealed space of the vial is 100 pg/mL or less; and (C) the gas in the sealed space of the vial contains 5-methylthiopentanenitrile when the vial is maintained at 40° C. for 30 minutes in (B) above.