An alternative or archaic spelling of fluorescein, a bright green fluorescent dye used in scientific and medical applications.
An older variant of 'fluorescein' without the final '-e', reflecting historical inconsistencies in chemical nomenclature before modern standardization.
Finding old scientific papers with variant spellings like 'fluorescin' versus 'fluorescein' is a reminder that chemistry is a young science—consistent naming only happened in the last 150 years!
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