A hair coloring method in which an undiluted hair dyeing composition is applied to hair, for example, a hair root, and the diluted hair dyeing composition is applied to hair, for example, the length and tip of the hair, wherein a non-aqueous liquid is applied A method of adding a diluent composition comprising a non-diluted hair coloring composition to obtain a diluted hair coloring composition.非希釈の毛髪染色組成物を毛髪、例えば、毛根に塗布し、希釈された毛髪染色組成物を毛髪、例えば、毛髪の長さ部分及び先端に塗布する毛髪染色方法であって、非水性液体を含む希釈剤組成物を非希釈の毛髪染色組成物に添加して希釈された毛髪染色組成物を得る、方法。