abstract |
Described is a method for preserving an aqueous solution comprising a leuco chromogen, comprising adding at least one compound selected from the group consisting of polyoxyethylene alkylamine and polyoxyethylene alkenylamine to the aqueous solution containing a leuco chromogen, and a method for stabilizing a leuco chromogen, comprising allowing the leuco chromogen to coexist in an aqueous solution comprising at least one compound selected from the group consisting of polyoxyethylene alkylamine and polyoxyethylene alkenylamine. |