Abstract: A multi-agent type hair treatment agent comprising a first composition containing component (A) and component (B); and a second composition containing component (C), wherein the weight ratio (H)/(C) of component (H) to component (C) in the second composition is less than 1. A hair treatment method comprising the steps of applying and rinsing the first composition to hair (i) and then applying the second composition to hair (ii). Component (A): a carboxylic acid having an inorganic value of 230 or more and 450 or less and an organic value of 50 or more and 250 or less, or a salt of the carboxylic acid Component (B): anionic surfactant Component (C): an aromatic sulfonic acid having a molecular weight of 300 or less or a salt thereof Component (H): cationic surfactant.

Abstract: A multi-agent type hair treatment agent comprising a first composition containing component (A) and component (B); and a second composition containing component (C), wherein the weight ratio (H)/(C) of component (H) to component (C) in the second composition is less than 1. A hair treatment method comprising the steps of applying and rinsing the first composition to hair (i) and then applying the second composition to hair (ii).

Abstract: A method for treating hair, in which using as a boundary a depth X % in a range of 5% to 80% from the surface of hair toward the center along the long diameter axis extending through the center of the cross-section of hair, hair is divided into an A layer (a portion of a continuous color from the surface of hair to the depth X %) and a B layer (a portion including the center and having a continuous color different from the A layer, in which the depth from the surface of hair exceeds X %) and at least one value of ?E*, ?h and ?C* between the color of the A layer and the color of the B layer is adjusted to 3 or more to change the hue and the color tone of hair appearance depending on viewing angle of the hair. A method for dyeing hair, having Step (I) of dyeing hair with a two-part permanent hair dye agent, and Step (II) of dyeing hair with a hair dye agent comprising a dye selected from (A-1) to (A-8).

Abstract: A method for treating hair, in which using as a boundary a depth X % in a range of 5% to 80% from the surface of hair toward the center along the long diameter axis extending through the center of the cross-section of hair, hair is divided into an A layer (a portion of a continuous color from the surface of hair to the depth X %) and a B layer (a portion including the center and having a continuous color different from the A layer, in which the depth from the surface of hair exceeds X %) and at least one value of ?F*, ?h and ?C* between the color of the A layer and the color of the B layer is adjusted to 3 or more to change the hue and the color tone of hair appearance depending on viewing angle of the hair. A method for dyeing hair, having Step (I) of dyeing hair with a two-part permanent hair dye agent, and Step (II) of dyeing hair with a hair dye agent comprising a dye selected from (A-1) to (A-8).

Abstract: A hair treatment agent containing the following components (A) to (D) and water: (A) succinic acid or a salt thereof: 0.1 mass % or more and 2 mass % or less in terms of succinic acid; (B) erythritol: 0.5 mass % or more and 15 mass % or less; (C) at least one aromatic alcohol selected from the group consisting of benzyl alcohol, phenoxyethanol and benzyloxyethanol; and (D) at least one of polyoxyalkylene glycol with an alkylene group having 2 or 3 carbon atoms: 0.01 mass % or more and 5 mass % or less, in which the mass ratio of component (C) to component (D), (C)/(D), is 0.1 or more and 20 or less.

Abstract: A method for acquiring hair characteristic data includes an image acquiring step and a data acquiring step. The image acquiring step acquires a cross-sectional image of a human hair 50, in which plural types of fibrous tissues (ortho cell 52a, para cell 52b) constituting cortex cells 52 contained in the human hair 50 are visualized so as to be distinguishable from each other. The data acquiring step acquires numerical information indicating a distribution state of the visualized plural types of fibrous tissues (ortho cell 52a, para cell 52b) from the cross-sectional image.

Abstract: A relation equation between wave information on unpermed hair strands and evaluation values of appearance of whole hair selected from among gloss of the whole hair, order of alignment of the hair strands, and frizziness of the hair strand is acquired from a plurality of subjects. Based on the relation equation, the appearance of whole hair of an arbitrary subject is evaluated from wave information on a hair strand of the arbitrary subject. This allows an objective evaluation of the gloss of whole hair, the order of alignment of hair strands, or the frizziness of the hair strand by a simple technique, and also allows an objective evaluation corresponding to cosmetic specialists' evaluations in terms of equivalent age.

Abstract: A method for acquiring hair characteristic data includes an image acquiring step and a data acquiring step. The image acquiring step acquires a cross-sectional image of a human hair 50, in which plural types of fibrous tissues (ortho cell 52a, para cell 52b) constituting cortex cells 52 contained in the human hair 50 are visualized so as to be distinguishable from each other. The data acquiring step acquires numerical information indicating a distribution state of the visualized plural types of fibrous tissues (ortho cell 52a, para cell 52b) from the cross-sectional image.

Abstract: A relation equation between wave information on unpermed hair strands and evaluation values of appearance of whole hair selected from among gloss of the whole hair, order of alignment of the hair strands, and frizziness of the hair strand is acquired from a plurality of subjects. Based on the relation equation, the appearance of whole hair of an arbitrary subject is evaluated from wave information on a hair strand of the arbitrary subject. This allows an objective evaluation of the gloss of whole hair, the order of alignment of hair strands, or the frizziness of the hair strand by a simple technique, and also allows an objective evaluation corresponding to cosmetic specialists' evaluations in terms of equivalent age.

Abstract: Provided is a hair frizziness reducing agent containing a lower alcohol and water, having a viscosity of from 1 to 90,000 mPa·s and used by leaving, after application to the scalp, the agent as is without washing it away.

Abstract: This invention relates a hair cosmetic composition, which comprises (A) glycine or alanine, (B) an &agr;-hydroxy acid, &bgr;-hydroxy acid, 1,2-dicarboxylic acid, 1,3-dicarboxylic acid or aromatic carboxylic acid, and (C) a cationic surfactant. The hair cosmetic composition is excellent in the effect of improving optical or mechanical properties of hair.

Abstract: This invention relates to a hair cleansing composition, which comprises (A) 0.01 to 20 wt. % of glycine or alanine, (B) 0.01 to 5 wt. % of an &agr;-hydroxy acid, &bgr;-hydroxy acid, 1,2-dicarboxylic acid, 1,3-dicarboxylic acid or aromatic carboxylic acid, and (C) 5 to 40 wt. % of an anionic surfactant selected from an alkylsulfuric acid salt, an alkylethersulfuric acid salt or an N-alkylamidoalkanolsulfuric acid ester salt. The hair cleansing composition is excellent in the effect of improving optical or mechanical properties of hair.

Abstract: The invention relates to a hair treatment composition comprising (a) a guanidium salt, (b) an alkalizing agent other than the guanidium salt and (c) a silicone. The use of the hair treatment composition permits brightening the color tone of the hair or dyeing the hair in good shades from a bright shade to a deep shade. The composition scarcely damages the hair, gives off little irritating odor and has low irritativeness to the scalp.

Abstract: The object of the invention is a new isomer mixture of 3-hydroxybutyl monothioglycollate and 3-hydroxy-1-methyl propyl monothioglycollate in a weight proportion of about 1.5:1 to 4:1, preferably about 2:1 to about 3:1, comprising less than 5%, preferably less than 2% by wt., of 1,3-butanediol thioglycollate, and its use as the sole or main reducing agent in compositions for permanent waving of human hair. The compositions have reduced smell, good waving properties and an extremely low sensitizing potential on human skin.

Abstract: The object of the invention is a composition for permanent waving of human hair comprising, as sole or main reducing agent one or several polyglycol monothioglycollates or lactates of the general formula ##STR1## wherein R denotes a hydrogen atom or a methyl group, X represents an ethoxy or propoxy group, and n is a number from 2 to 5. These compositions have a low characteristic smell, good waving properties, and an extremely low skin sensitizing potential.