Fd & C Blue No.2

FD & C Blue No.2
Common Name: Indigotine or Indigo CarmineChemical Name: Disodium salt of 5,5'- disulpho-3-3' dioxo-





2 2'- biindolineCI No. 73015; CI Food Blue CAS No. 860-22-0Structural formula NameU.S. FD & C Blue #2 Certified E.C. Indigo Carmine E 132  Dye Content85% min.  85% min. Volatile Matter & Salt 15% max - Water Insolubles 0.4% max. 0.2% max. Intermediates (Combined totals) -0.5% max. Isatin-5-Sulphonic Acid 0.4% max.- 5-Sulphoanthranilic Acid 0.2% max.-Subsidiary Dyes- 1.0% max. Isomeric 18.0% max. 18.0% max. Lower Sulphonated2.0% max-Trisulphonated 1.0% max.-Heavy Metals- 40 ppm max. Mercury 1 ppm max 1 ppm max.Lead10 ppm max 10 ppm max.Arsenic 3 ppm max.3 ppm max.Cadmium-1 ppm max. Total Primary Amines - 0.01% max. Ether Extracts - 0.2% max.