Indigo 95% (dye content), Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY
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Synonyms: Vat Blue 12-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-oneIndigotinPigment Blue 66Indigo (synthetic)2,2'-Bis(2,3-dihydro-3-oxoindolyliden)

M-Clarity™ quality level = MQ200

229296-100GEA 101 GBP
229296-100G 229296-25G
Indigo 95% (dye content), Sigma-Aldrich®
Indigo

Indigo has been used as a dye to measure food consumption in drosophila. It has also been used to investigate the ability of fungal strains in the degradation and decolorisation of indigo dye.


Indigo is a rich blue color dye. It can be extracted from plants of genus indigofera and can also be produced synthetically. Indigo is a vat textile dye, widely used on cellulosic fibers like cotton. Additionally, it is also used to inhibit corrosion of mild steel in aerated sulfuric acid.

Formula: C₁₆H₁₀N₂O₂
MW: 262.27 g/mol
Melting Pt: >300 °C (lit.)
Density: 1.35 g/cm³ (20 °C)
Storage Temperature: Room Temperature
MDL Number: MFCD00005722
CAS Number: 482-89-3
EINECS: 207-586-9
Merck Index: 12,04977
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Specification Test Results

Appearance (Form) Powder
Infrared spectrum Conforms to Structure
Wavelength in chloroform 599 - 605 nm
Extinction Coefficient ≥8000
Wavelength 282 - 288 nm
Extinction Coefficient ≥13500
Carbon 68.9 - 77.7%
Nitrogen 10.0 - 11.3%

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