Sudan IV / No.4 Sudan Red / scarlet / oil soluble dark red / Solvent Red 24 / Sudan B

English name：Sudan Ⅳ；Sudan red BB；Scarlet red；Solvent red 24；Oil red Ⅳ；Biebrich scarlet Rfat solube；Fat ponceau；o-Tolylazo-tolylazo-β-naphthol ；C.I. 26105

Other names: Sudan red No. 4; Scarlet; O-tolylazo-3-naphthol; Oil soluble dark red; Solvent Red 24; Sudan Red B; 1 - [4 - (o-toluenzo) o-toluenzo] - 2-naphthol; 1 - (2-methyl-4 - (2-methylphenylazo) phenylazo) - 2-naphthol; O-tolylazo-2-naphthol; Oil soluble red; Candlelight

CAS No.: 85-83-6

C24H20N4O=380.45

Grade: high purity grade

Dye Content：>80%

Absorption Maximum(nm)：515～525

Biological Test：PASS

Physicochemical properties: dark brown powder. No smell. The agglomerates are softened at 175 ℃, melted and decomposed at 181-188 ℃, and completely decomposed at 260 ℃. 1g is soluble in 15ml chloroform, easily soluble in benzene, soluble in oil, fat, paraffin oil, phenol, slightly soluble in ethanol and acetone, almost insoluble in water. It is a slightly purplish red solution in alcohol or benzene. When the alcohol solution meets with sodium hydroxide, it will turn red purple, and when sulfuric acid is blue-green. When diluted, it will form a red precipitate

Purpose: biochemical research. Oil and fat staining, Sudan Ⅳ can be replaced by oil red O to make high temperature thermometer color

Saving: RT