Description
An indigoid dye and a redox indicator; upon reduction, shifts from blue to yellow with absorbance maxima of 610 and 407 nm, respectively
Formal name: 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-1H-indole-5-sulfonic acid, disodium salt
Synonyms: Acid Blue 74|C.I. 73015|C.I. 75781|FD and C Blue 2|indigo disulfonate|Indigotine
Molecular weight: 466.4
CAS: 860-22-0
Purity: ≥70%
Formulation: A crystalline solid