Tartrazine/Tartar yellow

English Name: tartrazine; Tartar yellow； 3-Carboxy-5-hydroxy-1-p-sulfophenyl-4-p-sulfophenylazopyrazole trisodium salt； 4-(p-Sulfobenzeneazo)-1-p-sulfophenyl-5-hydroxypyrazole-3-carboxylic acid trisodium salt； C.I.19140

Other names: hydrazine yellow; Eat lemon yellow; Acid yellow 23; Trisodium salt of 1- (4-sulfophenyl) - 4- (4-sulfophenylazo) - 5-pyrazolone-3-carboxylic acid; Edible Pigment Yellow No. 5; Tatchin

CAS No.: 1934-21-0

C16H9N4Na3O9S2=534.36

Grade: BS

Content: ≥ 85.0%

Heavy metals: ≤ 40ppm

Arsenic: ≤ 3ppm

Lead: ≤ 10ppm

Physicochemical Properties: orange yellow powder. The solubility at 21 ℃ is: 11.8% water, 9% 10% ethanol, 3% 50% ethanol, soluble in glycerol, propylene glycol, insoluble in oil. It is an azo acid dye with good heat resistance, acid resistance, light resistance and salt resistance. It is very stable in citric acid, tartaric acid and other solutions. Poor oxidation resistance, slightly red in case of alkali, and discolored during reduction. Melting point: 300 ℃.

Purpose: biochemical research. For biological dyeing. Adsorption indicators for precipitation titration, such as chlorine and iodine ions for silver salt titration, are also used as redox indicators. Manufacture yellow filters for photographic lenses.

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