PROBLEM TO BE SOLVED: To provide a hair cosmetic capable of easily obscuring white hair by covering the hair surface with a melanin polymer in a single use by a hair-care act such as daily styling, and capable of dyeing hair at a sufficient level in plural continuous uses.SOLUTION: A hair cosmetic contains components (a), (b) and (c), where the pH at 25°C is 7.5 or more and 12 or less, and the molar ratio (b)/(a) of the component (b) to the component (a) is 0.01 or more and 0.45 or less. (a) A melanin precursor represented by the general formula (1) [where the dash line represents the presence or absence of a π bond, R1 represents a hydroxyl group or an acetoxy group, R2 represents H, -COOR (where R is H, CH3 or C2H5) or -COO- X+ (where X+ is a cation), and R3 represents H, an acetyl group, CH3 or C2H5] (b) a divalent iron ion and (c) an anionic coat-forming polymer.COPYRIGHT: (C)2014,JPO&INPIT【課題】日常のスタイリングなどの単回使用のヘアケア行動で、毛髪表面をメラニン重合物で覆うことで、簡単に白髪を目立たなくすることができ、複数回の継続使用で髪を十分なレベルまで染めることができる毛髪化粧料の提供。【解決手段】成分(a)、(b)及び(c)を含有し、25℃におけるpHが7.5以上12以下であり、成分(a)に対する成分(b)のモル比(b)/(a)が0.01以上0.45以下である毛髪化粧料。(a) 一般式(1)で表されるメラニン前駆体〔式破線はπ結合の存在又は不存在、R1は水酸基又はアセトキシ基、R2はH、-COOR(RはH、CH3又はC2H5)又は-COO- X+(X+は陽イオン)、R3はH、アセチル基、CH3又はC2H5を示す〕(b) 二価の鉄イオン(c) アニオン性の皮膜形成ポリマー【選択図】なし
