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Nhile working on the condensation of diphenic anhydride with reeoroinol R. B. French **** found that rseorcinol andergoee an autocondensvti on lhen heated with dehydrating agents. The produot obtained in thle condensation he* a prominent green fluorescence which la strikingly similar to that of fluorescein. From the method of condensation it waa assumed that the resulting compound was meta-hydroxy rhenyl ether, and that this substance had fluorescent properties.