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Fat Red 7B is a red diazo dye. Chemically it is N-ethyl-1-[[p-(phenylazo)phenyl]azo]-2-naphthalenamine. It is soluble in oils and insoluble in water.
F 1270 (OTTO) Fat Red 7B Cas 6368-72-5 - used to study the effects of emulsifying agents on disposition of lipid soluble drugs included in fat emulsion.