Abstract: A hair treatment method comprising steps [A-1], [B], and [C], wherein the method is carried out in the order of [A-1]?[B]?[C], or in the order of [B]?[A-1]?[C]: step [A-1]: a step of applying a first hair treatment agent comprising an organic acid having a solubility in 100 mL of water at 20° C. of 50 g or less or a salt of the organic acid, as component (A1), to hair, and rinsing the hair; step [B]: a step of applying a second hair treatment agent comprising a carboxylic acid having an inorganic value of 250 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, as component (B), to the hair; and step [C]: a step of applying a third hair treatment agent comprising an aromatic sulfonic acid having a molecular weight of 300 or less or a salt thereof, as component (C), to the hair.

Abstract: The present invention is directed to a composition, process, and kit for semi-permanent straightening and curling of keratin fibers. The combination of glyoxylic acid and alkyl glyceryl ethers or alkyl polyglyceryl ethers in an emulsion provide for a thermoplastic effect which allow for improved restylability of the keratin fibers.

Abstract: A hair treatment method comprising steps (i) to (iii): step (i): a step of applying a hair treatment agent containing components (A) and (B) to hair; step (ii): a step of leaving the hair to stand, after step (i); and step (iii): a step of applying a hair treatment agent containing component (C) to the hair, after step (ii), (A) a compound selected from the group consisting of a glycylglycine derivative, a polyglycerin, and an alkyl glyceryl ether; (B) a carboxylic acid having an inorganic value of 250 to 450 and an organic value of 50 to 250, or a salt of the carboxylic acid; (C) an aromatic sulfonic acid having a molecular weight of 300 or less, or a salt thereof.

Abstract: A method for treating hair, comprising the following steps: step (i): a step of applying a first composition comprising carboxylic acid having an inorganic value of 250 to 450 and an organic value of 50 to 250, or a salt of the carboxylic acid, as a component (A), to hair, step (ii): a step of leaving the hair, to which the first composition has been applied, at a temperature of 15° C. to 100° C. for 15 seconds to 60 minutes, and step (iii): a step of applying a second composition comprising aromatic sulfonic acid or a salt thereof having a molecular weight of 300 or less, as a component (B), to the hair after completion of the step (ii).

Abstract: A method of evaluating inhibitory effect on damp-dry malodor, containing the steps of: bringing microorganisms which produce damp-dry malodor-causing substances and a test substance into contact with each other in the presence of a sebaceous dirt component; detecting expression of at least one kind of gene selected from a fatty acid desaturase gene and a ? oxidation-related enzyme gene derived from the microorganisms; and thereby evaluating a damp-dry malodor inhibitory function of the test substance based on a change in expression amount of the at least one kind of gene.

Abstract: A method of evaluating inhibitory effect on damp-dry malodor, containing the steps of: bringing microorganisms which produce damp-dry malodor-causing substances and a test substance into contact with each other in the presence of a sebaceous dirt component; detecting expression of at least one kind of gene selected from a fatty acid desaturase gene and a ? oxidation-related enzyme gene derived from the microorganisms; and thereby evaluating a damp-dry malodor inhibitory function of the test substance based on a change in expression amount of the at least one kind of gene.

Abstract: A method of screening a damp-dry malodor inhibitor, containing the steps of: bringing microorganisms having a 4-methyl-3-hexenoic acid production capacity into contact with a test substance in the presence of a sebaceous dirt component, detecting the production of a damp-dry malodor-causing substance by the microorganisms, and thereby selecting a test substance having a damp-dry malodor inhibitory function; and a method of evaluating a damp-dry malodor inhibitor, containing the steps of: bringing microorganisms having a 4-methyl-3-hexenoic acid production capacity into contact with a test substance in the presence of a sebaceous dirt component, detecting the production of a damp-dry malodor-causing substance by the microorganisms, and thereby evaluating the damp-dry malodor inhibitory function of the test substance.

Abstract: A method of screening a damp-dry malodor inhibitor, containing the steps of: bringing microorganisms having a 4-methyl-3-hexenoic acid production capacity into contact with a test substance in the presence of a sebaceous dirt component, detecting the production of a damp-dry malodor-causing substance by the microorganisms, and thereby selecting a test substance having a damp-dry malodor inhibitory function; and a method of evaluating a damp-dry malodor inhibitor, containing the steps of: bringing microorganisms having a 4-methyl-3-hexenoic acid production capacity into contact with a test substance in the presence of a sebaceous dirt component, detecting the production of a damp-dry malodor-causing substance by the microorganisms, and thereby evaluating the damp-dry malodor inhibitory function of the test substance.