| abstract |
A cosmetic for hair coloring or hair decoloring, the cosmetic comprising: a first agent that contains an alkali agent; and a second agent that contains hydrogen peroxide. One of the first agent and the second agent has a viscosity of 100 mPa∙s or lower, the other has a viscosity of 1000 mPa∙s or higher, the mixture of the first agent and the second agent contains components (A)-(D), and the mass ratio [(B)+(C)]/(A) of the mixture is 2-11. (A) is a polymer that includes a diallyl quaternary ammonium salt as a structural unit and that has a charge density of 2.5-9 meq/g, (B) is a compound represented by formula (3) R 5 -O-(CH 2 CH 2 O) n -[CH 2 CH(CH 3 )O] m -SO 3 M 1 (R 5 being a C 8-25 hydrocarbon group, n being an average number of added moles of 0-50, m being an average number of added moles of 0-50, and M 1 being an alkali metal or NH 4 ), (C) is an anionic surfactant that has a carboxy group, and (D) is a polyoxyethylene nonionic surfactant that has an average number of added moles of oxyethylene groups of 90-250. |