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Azorubine

Chemical compound
Azorubine is an azo dye consisting of two naphthalene subunits. It is a red solid. It is mainly used in foods that are heat-treated after fermentation. It has E number E122. Wikipedia
Appearance: red powder
Formula: C20H12N2Na2O7S2
Molar mass: 502.431 g/mol
Solubility in water: Soluble (120g/L)
Melting point: >300 °C (572 °F)
PubChem CID: 19118