METHOD FOR STORING LEUCO CHROMOGEN-CONTAINING AQUEOUS SOLUTION

摘要

Disclosed are: a method for storing a leuco chromogen-containing aqueous solution, which is characterized by adding a compound that contains at least one substituent selected from the group consisting of a nitroso group and an azo group and has metal ion coordination ability or a salt of the compound to a leuco chromogen-containing aqueous solution; a method for stabilizing a leuco chromogen, which is characterized in that a leuco chromogen is made to coexist in an aqueous solution that contains a compound that contains at least one substituent selected from the group consisting of a nitroso group and an azo group and has metal ion coordination ability or a salt of the compound; and a liquid reagent which contains a leuco chromogen and a compound that contains at least one substituent selected from the group consisting of a nitroso group and an azo group and has metal ion coordination ability or a salt of the compound.