carmoisine and its Impurities

Azorubine is a red solid. It is mainly used in foods that are heat-treated after fermentation. It is an azo dye consisting of two naphthalene subunits. In the US, this color was listed in 1939 as D&C Red No. Reference standards of Carmoisine API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below