Abstract
Oil red O (xylene-azo-xylene-azo-β-naphthol), oil red 4B or EGN (xylene-azo-toluene-azo-β-naphthol) and Sudan red 4B give somewhat deeper orange red or red fat stains and more stable dilute isopropanol solutions than Sudan IV. Sudan II gives brighter orange-yellow fat stains and stronger stable dilute isopropanol solutions than Sudan HI. Satisfactory brownish red dyes as to intensity and stability of their dilute isopropanol solutions are Sudan brown, Sudan brown 5B, and oil brown D.

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