Provided is a method for hair dyeing or bleaching using a two-part hair dye or bleach kit including a two-part hair dye or bleach composition including a first agent (1) which contains an alkaline agent and a second agent (2) which contains hydrogen peroxide, a container body (12a), and a pump foamer (20) attached to the container body (12a). At least one of the first agent and the second agent contains a foaming agent. A viscosity of liquid mixture (3) is in a range of from 1 to 300 mPa·s at 25°C. A discharge mass of the pump foamer (20) per single depression operation is 1 g or more.本發明係一種毛髮之染毛或脫色方法，其係使用二劑式染毛用或脫色用套組者，該二劑式染毛用或脫色用套組包括：包含含有鹼劑之第1劑(1)與含有過氧化氫之第2劑(2)的二劑式染毛用或脫色用組合物，以及容器本體(12a)及安裝於容器本體(12a)之起泡泵(20)。第1劑或第2劑之至少一者含有起泡劑。混合液(3)之黏度於25℃下為1~300 mPa‧s。起泡泵(20)每1次按壓操作之噴出質量為1 g以上。
