PROBLEM TO BE SOLVED: To provide a hair dye composition with a little difference to the color tone of the hair root and end, and to provide a hair dyeing method for applying the composition to the hair.SOLUTION: The invention provides a hair dye composition containing the following azo dyes (R), (B), and (Y), with a pH (25°C) of 7.5-12 when in use, and a hair dyeing method comprising applying the hair dye composition to the hair, leaving it to stand for 1-60 minutes, and subsequently washing away. The mass ratio of the azo dye (R), (B), and (Y), [(R)+(Y)/(B)] in all the compositions is preferred to be 0.2-5, and further the hair dye composition is preferred to contain 0.01-20 mass% of an alkali agent.COPYRIGHT: (C)2016,JPO&INPIT【課題】根元と毛先の色調に違いの少ない染毛剤組成物、及び該組成物を毛髪に適用する染毛方法の提供。【解決手段】下記のアゾ染料(R)、(B)及び(Y)を含有し、使用時のpH(25℃)が7.5~12である染毛剤組成物、及び該染毛剤組成物を毛髪に適用し、1~60分間放置した後、洗い流す染毛方法。該アゾ染料(R)、(B)、及び(Y)の全組成物中における質量比率〔(R)+(Y)〕/(B)は、0.2~5であることが好ましく、更にアルカリ剤を0.01~20質量%含有することが好ましい染毛剤組成物。【選択図】なし
