Specification Product Name INDIGO CARMINE Synonyms Acid Blue 74; 5,5'-Indigodisulfonic acid, disodium salt CAS NO. 860-22-0 C. I. No. 73015 Molecular Formula C20H10Na2O5 Formula Weight 376.3 Appearance Blue to deep violet powder Structure     Tests    Limits Total Content, corrected for sample for dried at 105-+1`cfor 2 hrs. - Min 85% Loss on drying at 135c & Chlorides & Sulphates expressed as sodium - Max 15% Water-Insoluble matter, by mass - Max 0.4%         REVISED: 1-1-2011