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Sudan Yellow a3G, also known as Solvent Yellow 16, C.I. disperse yellow and C.I. 12700, is a yellow azo dye. Chemically it is 4-phenylazo-1-phenyl-3-methyl-5-pyrazolone or 2,4-dihydro-5-methyl-2-phenyl-4-(phenylazo)-3H-pyrazol-3-on. It is soluble in fats and oils.
Sudan Yellow 3G is used as a pigment in cosmetics and printer toners, and as a dye in inks, including inks for inkjet printers. In pyrotechnics, it is used in some yellow colored smokes.
References
Sudan Yellow 3G Wikipedia(Text) CC BY-SA