PROBLEM TO BE SOLVED: To provide a hair dye having superior hair dyeing property and hair dyeing reproducibility, with superior toughness of dyed hair condition against shampoo, conditioner or light and causing reduced damage to hair.SOLUTION: The hair dye comprises, together or separately, (a) a carboxylic acid silver salt and/or a sulfonic acid silver salt, and (b) a reductone [such as a reductone of formula (I) (wherein, R represents a hydrogen atom or hydroxy and p represents an integer of 1 to 4)].COPYRIGHT: (C)2008,JPO&INPIT【課題】染毛性及び染毛再現性に優れており、シャンプー、リンス、又は光などに対して染毛状態の堅牢性が高く、しかも毛に与える損傷が少ない染毛剤を提供する。【解決手段】染毛剤であって、(a)カルボン酸銀塩及び/又はスルホン酸銀塩、並びに(b)レダクトン類(例えば下記式(I)のレダクトン類、Rは水素原子又は水酸基を示し;pは1~4の整数を示す)を同時に又は別々に含む染毛剤。
