scarlet red

scarlet red
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. SYN: Biebrich s., medicinal s., scharlach red, Sudan IV.

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scarlet red n SUDAN IV

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a red fat-soluble azo dye, used as a biological stain for fats. Called also oil r. IV, ponceau 3B, scarlet R, scharlach R, and Sudan IV.

Medical dictionary. 2011.

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