抄録
It is already known that the aqueous solution of stilbene-type fluorescent dye is unstable against the sunlight and there is a report on a few stilbene derivatives that this was due to cis-traps geometrical isomerization by the ultraviolet light. In this experiment, one of the representative product from bistriazinyl-aminostilbene-type fluorescent dyes having value for practical use has been investigated in order to prevent the phenomenon of deterioration by light. The result indicated that some knowledge was obtained for the relation between the effect of time of exposure to sunlight and the photochemical change of aqueous solution of fluorescent dye as well as the effect of concentration of aqueous solution of fluorescent dye.
