Indigo Carmine Properties, Molecular Formula, Applications - WorldOfChemicals

Indigo Carmine Properties

Indigo Carmine

Molecule Structure Image



Indigo carmine is a pH indicator. It is approved for use as a food colorant in the USA and the EU. It is also a redox indicator, turning yellow upon reduction. Another use is as a dissolved ozone indicator. It is also used as a dye in the manufacturing of capsules, and in obstetrics, Indigo carmine-based dye is used to detect amniotic fluid leaks.

Chemical Properties

AR Assay ~ 93.0%
Appearance Purple solid
CAS Number 860-22-0
Density 1.01 g/ml
EINECS Number 212-728-8
HS Code 32041200
IUPAC Name 3,3'-Dioxo-2,2'-bis-indolyden-5,5'-disulfonic acid disodium salt
InChI 1S/C16H10N2O8S2.2Na/c19-15-9-5-7(27(21,22)23)1-3-11(9)17-13(15)14-16(20)10-6-8(28(24,25)26)2-4-12(10)18-14;;/h1-6,17-18H,(H,21,22,23)(H,24,25,26);;/q;2*+1/p-2/b14-13+;;
Lab Grade AR
Melting Point >300°C
Molar Mass 466.36 g/mol
Molecular Formula C16H8N2Na2O8S2
RTECS Number DU3000000
Refractive n20/D 1.335
Solubility 10 g/l
Synonyms 1H-Indole-5-sulfonicacid, 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-,disodium salt;Indigotine;5,5'-Indigodisulfonic Acid Sodium Salt;C.I. Acid Blue 74;Indigo Carmine;FD&C Blue #2