C16H10N2O2
262.26 g/mol
Dye & PigmentWarning
INDIGO
CAS482-89-3EC207-586-9
Category
Dye & Pigment
Compound Class
Natural Product
Primary Use
blue vat dye
Indigo is a blue vat dye historically derived from plants and now produced synthetically. It is primarily used for dyeing textiles, especially denim for blue jeans, due to its distinctive color and excellent fastness properties.
Dyeing cotton and cellulosic fibersColoring denim fabricVat dyeing processes
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
ReferenceSame Category
Direct Red 31
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Direct dye for textiles
ReferenceSame Category
Pergascript Red I 6B
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red dye for printing and copying
ReferenceSame Category
Fluorescent brightener 367
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fluorescent whitening agent
ReferenceSame Category
Solvent red 49
CAS509-34-2
solvent red dye
Referencesame scaffold
Pigment Blue 63
CAS16521-38-3
Food colorant lake pigment
Referencesame scaffold
Indigotindisulfonate sodium
CAS860-22-0
synthetic food colouring dye
Referencesame scaffold
5,5',7,7'-tetrabromoindigo
CAS2475-31-2
Vat dye for textiles
Safety Reference
Warning
H373May cause damage to organs through prolonged or repeated exposure
Customs Tariff Classification
The international HS code for INDIGO (CAS 482-89-3) is 3204.15.
HS code (international, 6-digit)
3204.15
EU CN code (8-digit)
3204 15 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2-(3-hydroxy-1H-indol-2-yl)indol-3-one
InChIKey
QQILFGKZUJYXGS-UHFFFAOYSA-N
SMILES
C1=CC=C2C(=C1)C(=C(N2)C3=NC4=CC=CC=C4C3=O)O
Synonyms (84)
- INDIGO
- Indigo, EuropePharmacopoeia (EP)
- (2,2'-Biindoline)-3,3'-dione
- .DELTA.2,2'-Bipseudoindoxyl
- 11669 Blue
- Blue No. 201
- C.I. Vat Blue 1
- Cystoceva
- D And C Blue Number 6
- D and C Blue No. 6
- D&C Blue 6
- D&C Blue No. 6
- Diindogen
- Indigo (C.I. 73000)
- Indigo (Technical Grade)
- Indigo (VAN)
- Indigo (synthetic)
- Indigo Blue
- Indigo CRS
- Indigo Ciba
- Indigo Ciba SL
- Indigo J
- Indigo N
- Indigo NAC
- Indigo NACCO
- Indigo P
- Indigo PLN
- Indigo Powder W
- Indigo Pure BASF
- Indigo Pure BASF Powder K
- Indigo VS
- Indigo,natural
- Indigoblau
- Indigotin
- Indigotin (natural)
- Lithosol Deep Blue B
- Lithosol deep blue V
- Mitsui Indigo Paste
- Mitsui Indigo Pure
- Modr Kypova 1 [Czech]
- Modr kypova 1
- Monolite Fast Navy Blue BV
- Synthetic Indigo
- Synthetic Indigo TS
- Vat blue 1
- Vulcafix Blue R
- Vulcafor Blue A
- Vulcanosine Dark Blue L
- Vulcol Fast Blue GL
- Vynamon Blue A
- [.DELTA.2,3'-dione
- cis-indigo
- indigo B
- indigo blue (powder)
- indigo dye
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