Hair treatment method and hair treatment tool

A hair treatment method for treating hair by using a hair treatment tool comprising a fiber structure member and a liquid-impermeable sheet to which the fiber structure member is fixed, the fiber structure member retaining a hair cosmetic that comprises a pigment and a film-forming resin, the fiber structure member retaining the hair cosmetic that comprises the pigment and the film-forming resin being sealed in a packaging, the method comprising:

• opening the package to expose a surface of the fiber structure member retaining the hair cosmetic that comprises the pigment and the film-forming resin;
• and
• bringing the fiber structure member retaining the hair cosmetic that comprises the pigment and the film-forming resin, whose surface has been exposed during said opening, into contact with hair, and in this state, moving the fiber structure member retaining the hair cosmetic that comprises the pigment and the film-forming resin in a direction of orientation of the hair, wherein
• the hair cosmetic comprises 70 mass % or greater of an organic solvent having a boiling point of from 50° C. to 260° C., and a content by percentage of water that is 10 mass % or less,
• the hair cosmetic is a temporary hair colorant,
• the fiber structure member has a structure formed by layering a plurality of layers,
• the fiber structure member comprises:
• an application layer comprising a surface layer constituting the surface that contacts the hair, and
• a lower layer arranged more toward the liquid-impermeable sheet side than the application layer;
• each of the application layer and the lower layer is constituted by a single layer or by a layered structure formed by layering a plurality of sheets each having a same impregnation rate of the hair cosmetic and a same content by percentage of cellulosic fiber;
• a content by percentage of cellulosic fiber in all constituent fibers of the application layer is different from a content by percentage of cellulosic fiber in all constituent fibers of the lower layer;
• and
• a content by percentage of cellulosic fiber in the lower layer with respect to the mass of all constituent fibers in the lower layer is from 60 to 95 mass %;
• or
• a content by percentage of cellulosic fiber in the application layer with respect to the mass of all constituent fibers in the application layer is from 60 to 95 mass %.