| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition for dyeing a keratin fiber such as human hair, showing a good resistance to attacking factors to the hair, not having selectivity and capable of dyeing more potently by including a specific cationic direct dye and a thickening polymer in a medium suitable for the dyeing. SOLUTION: This dyeing composition for a keratin fiber containing a cationic direct dye and a thickening polymer, is obtained by containing, in a medium suitable for the dyeing, (A) a cationic direct dye of the formula: A-N=N-B [A is a group of formula I (R1 is Cl, Br or the like; R2 is a 1-4C alkyl or the like; R3, R4 are each phenyl or the like; X- is chloride or the like) or the like; B is a group of formula II (R8 is H, Cl or the like; R9 is H, Br or the like; R10 is H, OH or the like) or the like] and (B) at least one kind of thickening agent selected from biopolysaccharide gums derived from microorganisms such as a nonionic guar gum, a sclerogulcan gum, etc., gums obtained from exuding liquids of plants such as a gum arabic, a pectin, an alginate, a starch and a carboxyalkyl cellulose.
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