PROBLEM TO BE SOLVED: To provide a non-oxidative one-pack hair-dyeing agent containing Black No.401 in at least a certain ratio, the hair-dyeing agent exhibiting good hair-dyeing properties and hardly causing skin coloration.SOLUTION: The non-oxidative one-pack hair-dyeing agent comprises components (A)-(E) and has a pH of 2-5: (A) 0.3-3 mass% of an acid dye component containing at least 18 mass%, based on the whole acid dye, of Black No.401 and optionally containing Orange No.205 within an amount range such that the mass ratio thereof to Black No.401 (Orange No. 205/Black No.401) is 4 or lower (B) 1-12 mass% of benzyl alcohol (C) 1-7 mass% of a diethylene glycol monoalkyl ether (D) 5-15 mass% of ethanol and (E) an organic carboxylic acid or a salt thereof.COPYRIGHT: (C)2011,JPO&INPIT【課題】黒色401号を一定割合以上含み、染毛性が良くかつ皮膚着色の少ない非酸化型一剤式染毛剤の提供。【解決手段】成分(A)~(E)を含有し、pHが2~5である非酸化型一剤式染毛剤。(A)全酸性染料中18質量%以上の黒色401号を含み、橙色205号を黒色401号との質量比(橙色205号/黒色401号)が4以下となる範囲内で含んでもよい酸性染料成分 0.3~3質量%(B)ベンジルアルコール 1~12質量%(C)ジエチレングリコールモノアルキルエーテル 1~7質量%(D)エタノール 5~15質量%(E)有機カルボン酸又はその塩【選択図】なし
