| abstract |
PROBLEM TO BE SOLVED: To provide a treating agent for an acidic hair dye capable of improving the dyeing property, transfer resistance, fastness to washing a hair and the like of an acid dye, and a method of dyeing hair using the same. . SOLUTION: This treatment agent is used before or at the time of dyeing hair with an acid hair dye for hair containing an acid dye, wherein the treatment agent contains at least one organic acid or inorganic acid. An aqueous liquid containing 0% by weight or more, in which a part of the acid is present in a state of remaining as a free acid, and the remaining part is in a salt state, and has a pH value of 2.0 to 6.0. At this time, as the acid, Alpha-hydroxy acids such as glycolic acid are preferred. In this method, after the above-mentioned treatment agent is applied to the hair, the hair is dyed using an acid hair dye for hair, or this treatment agent is applied to the hair together with the acid hair dye for hair. I do. |