Fluorescein is the precursor of the group of dyes collectively referred to as the eosins, but has little use itself in light microscopy even though it is strongly fluorescent. It is used to detect contamination in water supplies because of the intense fluorescence at low concentration. The closely related fluorescein isothiocyanate, is attached to antibodies and used as a fluorescent marker in immunofluorescence microscopy.
Uranin is the sodium salt of fluorescein.
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