| abstract |
The present invention provides the following hair-treatment composition, bleaching composition and hair color tone modifier composition: a hair-treatment composition containing: (1) a ferrous salt, and (2) a nonreducing organic chelate-forming compound capable of forming a chelate compound together with a ferrous ion, and having a pH value of from 3 to 6, wherein the stability constant (K1) between said ferrous ion and said nonreducing organic chelate-forming compound is lower than 3 and the ferrous salt; which is the chelate compound of said ferrous ion with said nonreducing organic chelate-forming compound, is highly soluble in water; a hair-treatment composition containing: (1) a ferrous salt, and (2) a nonreducing organic chelate-forming compound represented by the following general formula (I): <IMAGE> (I) wherein R represents a straight-chain or branched hydrocarbon group having 1 to 10 carbon atoms or an oxane ring, and m is an integer of from 1 to 6, capable of forming a chelate compound with a ferrous ion and having a pH value of from 3 to 6; a bleaching composition consisting of either one of the above-mentioned hair-treatment compositions as the primary agent together with an aqueous composition containing 0.01 to 3% by weight of hydrogen peroxide and having a pH value of from 3 to 6 as the secondary agent; and a hair color tone modifier composition obtained by adding a direct dye to the primary and/or secondary agents of the above-mentioned bleaching composition. |