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Blue No.2
| Legal color: | Blue No.2 | | General name: | Indigo Carmine | | Class: | Acid Dye | | FDA : | FD & C Blue No.2 | | CI #: | C.I. 73015 | | Color #: | Acid Blue 74 | | CAS #: | 860-22-0 | | CAS : | 1H-Indole-5-sulfonic acid,2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)- 2,3-dihydro-3-oxo-,disodium salt | | IUPAC: | →1;Disodium 2,2'-bi(2,3-dihydro-3-oxoindolylidene)-5,5'-disulfonate
→2;2,2'-Bi(2,3-dihydro-3-oxoindolylidene)-5,5'-disulfonic acid disodium salt
→3;Disodium 5,5'-indigodisulfonate →C5,5'-Indigodisulfonic acid disodium salt |
| Chemical structure: |  
Indigo Carmine |
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