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Medicinal scarlet red
From Biology-Online Dictionary | Biology-Online Dictionary
medicinal scarlet red -->
O-Tolylazo-o-tolylazo-beta-naphthol. An azo dye; a dark, brownish red powder, soluble in oils, fats, and chloroform, but insoluble in water; used in medicine as a vulnerary, in histology to stain fat in tissue sections and basic proteins at high pH, and in immunoelectrophoresis.
Synonym: biebrich scarlet red, medicinal scarlet red, scharlach red, sudan IV.