Chem. [f. Gr. ἠώς the morning red, the dawn + -IN.] A red dye-stuff produced by the addition of bromine to a solution of fluorescin in glacial acetic acid. Its potassium salt, known in commerce as ‘soluble eosin’ or ‘eosin,’ is used as a rose-colored dye. Also attrib.
1866. A. Flint, Princ. Med. (1880), 866. The addition of some coloring agent, such as iodine or eosine, is of assistance in searching for them.
1879. Watts, Dict. Chem., Eosin.
1885. Athenæum, 27 June, 827/3. Coal-tar colours, especially eosine reds, have been employed in the artificial flower manufacture.
