| http://www.w3.org/ns/prov#value | - The method of any one of claims 1 and 2, wherein the fluorescent dye is selected from the group consisting of:(1) compounds of the formula (I) ##STR9## where R1 is a hydrogen atom or a lower alkyl group, R2 and R3 each represent a hydrogen atom, a lower alkyl group or alower alkoxy group, R4 represents a hydrogen atom, an acyl group or a lower alkyl group, R5 represents a hydrogen atom or an optio
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