Indigo Carmine Specifications

Product Name Indigo Carmine
Colour Shade
Synonyms Food Blue 1, Indigotine
Chemical Name Disodium 3,3'-dioxo-2,2'-bi-indolylidene-5,5'-disulphonate
Molecular Formula C16H8N2Na2O8S2
C.I. No 73015
C.I. Name Acid Blue 74
FDA Status FD&C Blue #2
CAS No. 860-22-0
EINECS No. 212-728-8
Test EEC (Limit)
Total colouring matters calculated as the sodium salt percent by mass Min. 85
Water insoluble matter, percent by mass Max. 0.20
Combined ether extract, percent by mass Max. 0.20
Unsulfonated Primary Aromatic amines. percent by mass Max. 0.01
Subsidiary dyes, percent by mass Max. 1
Total organic compound other than colouring matters, percent by mass
Isatin-5-sulfonic acid,
5-sulfoanthranilic acid
Anthranilic acid
Max. 0.50
Heavy metals as pb(mg/kg.) Max. 40
Arsenic, (mg/kg.) Max. 3
Lead (mg/kg.) Max. 10
Mercury (mg/kg.) Max. 1
Cadmium (mg/kg.) Max. 1

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