Sudan'

given to several fat-dyes. s. brown, a brown stain for fats, derived from alpha naphthylamine. s. red III, sudan III, brown powder, amino azobenzene-azo beta naphthol (CjjHijNjO), used as a stain in histological technique; it colors fatty ti ues red, leaving connective ti ue uncolored, it also stains the fatty envelope of the tubercle bacillus, s. yellow G., me tad i oxy azobenzene, a yellow fat-stain.