| 主权项 |
1. A process for treating hair, characterized in that it comprises the following steps:
(a) application of a hair treatment composition (Dyeing/Straightening Composition) comprising at least one direct dye and at least one carboxylic acid of the formula (I) and/or a hydrate thereof and/or a salt thereof onto the hair:
R—CO—COOH Formula (I)wherein R is selected from hydrogen, COOH, CN, optionally substituted C1-C10 alkyl, optionally substituted C2-C10 alkenyl, optionally substituted C2-C10 alkynyl, optionally substituted C3-C10 cycloalkyl, optionally substituted C6-C10 aryl or a 5-10-membered, optionally substituted heteroaryl group, wherein the optional substituents of the alkyl group are selected from halogen, hydroxyl, amino and C1-C4 alkoxy, and the optional substituents of the other groups are selected from halogen, hydroxyl, amino, C1-C4 alkyl and C1-C4 alkoxy,
(b) leaving the composition on the hair for 1 to 120 minutes; (b′) optionally rinsing off the hair; (c) drying the hair; and (d) treating the hair with an iron having a surface temperature of 180±50° C. (e) optionally rinsing off and/or shampooing the hair and drying. |
