| 摘要 |
A stable aqueous solution comprising (a) 5-25% by weight of an optical brightening agent of formula I <IMAGE> I in which R1 to R9, X and A(-) are defined in the specification (b) 5-70% by weight of an organic monobasic acid or a mixture of organic monobasic acids selected from formic, acetic, propionic, butyric, glycollic and lactic acids, (c) 0-45% by weight citric acid (d) 5-55% by weight water the total amount of organic acids present being at least 40% by weight of the total composition, and the total amount of components a, b, c and d being at least 90% of the total solution. |
