A hair dye and hair-dyeing methods using the hair dye are provided. The
hair dye comprises, as essential ingredients, (i) a formulation primarily
composed of a dye component-including indican derived from indigo plants
and (ii) a formulation primarily composed of a .beta.-glucosidase enzyme
component. Hair is first mordanted with a dye mordant such as aluminum,
iron and the like, and then secondly the prepared hair dye is uniformly
applied to the hair either directly or as a mixture of the dye and a
proper amount of water. Upon completion of the hair-dyeing, hair is rinsed
with water and is finished by drying.
