PROBLEM TO BE SOLVED: To provide a hair decoloring agent or a hair dye which has excellent adhesion to the hair to precisely and easily apply it to hair bottom or hairline, and evenly and easily apply and spread it from the bottom to the tip at the portion that a user cannot confirm himself such as an occipital region so that levelness of dyeing of the whole hairs is excellent.SOLUTION: A cosmetic for hair decolorization or hair dyeing includes a mixture comprising a first agent containing an alkali agent in which viscosity is 20-100 Pa s, and a second agent containing a hydrogen peroxide in which viscosity is 20-100 Pa s or less. The mixture contains the following components (A)-(C): (A) a polymer containing a diallyl quaternary ammonium salt as a constituting unit and of which charge density is 4.0-8.0 meq/g (B) a sulfate anionic surfactant and (C) a N-acylamino acid salt, a N-acyl-N-alkylamino acid or an alkyl ether carboxylate, wherein mass ratio [(B)+(C)]/(A) is 1.0-5.0.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】頭髪への優れた密着性を有し根元部分や生え際に対し正確に塗布しやすい一方で、後頭部など使用者自身が確認しづらい箇所に対しても根元から毛先まで均一に塗り伸ばしやすく、頭髪全体の均染性に優れた毛髪脱色剤又は染毛剤の提供。【解決手段】アルカリ剤を含有し20~100Pa・sの第1剤、及び過酸化水素を含有し20~100Pa・s以下の第2剤を備え、これらの混合物中に成分(A)~(C)を含有し、質量比〔(B)+(C)〕/(A)が1.0~5.0である毛髪脱色用又は染毛用化粧品。 (A) ジアリル4級アンモニウム塩を構成単位として含み電荷密度が4.0~8.0meq/gの重合体 (B) 硫酸塩アニオン界面活性剤 (C) N-アシルアミノ酸塩、N-アシル-N-アルキルアミノ酸塩又はアルキルエーテルカルボン酸塩【選択図】なし
