| abstract |
PROBLEM TO BE SOLVED: To provide a substance in an aqueous liquid labeled with a dye useful for detection. A method for labeling a component in an aqueous liquid comprising: (A) A luminescent dye selected from the group consisting of cyanine, merocyanine and styryl dyes having at least one sulfonic acid group or sulfonate group bonded to an aromatic nucleus is added to the liquid containing the component, Reacting with the component, and (b) reacting the dye with the component such that the dye labels the component. [Selection figure] None |