C10H6Na2O8S2
364.3 g/mol
Dye & PigmentDanger
Chromotropic acid disodium salt
CAS129-96-4EC204-972-9
Category
Dye & Pigment
Compound Class
Organic Acid
Primary Use
Mordant dye and analytical reagent
Chromotropic acid disodium salt is a disodium salt of 4,5-dihydroxynaphthalene-2,7-disulfonic acid. It is primarily used as a mordant dye and an analytical reagent.
Mordant dyeAnalytical reagent
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
StrongSame Parent
Disodium chromotropate dihydrate
CAS5808-22-0
dye and pigment intermediate
ReferenceSame Category
Sodium naphthionate
CAS130-13-2
naphthalene sulfonate dye intermediate
ReferenceSame Category
2-(4-Aminophenyl)-6-methyl-1,3-benzothiazole-7-sulfonic acid
CAS130-17-6
Intermediate for azo dyes
ReferenceSame Category
1-Amino-8-naphthol-4,6-disulfonic acid
CAS130-23-4
intermediate for dye production
ReferenceSame Category
1-(2-Cyanostyryl)-4-(4-cyanostyryl)benzene
CAS13001-38-2
Fluorescent brightener
Referencestereoisomer of
Chromotropic acid
CAS148-25-4
Azo dye intermediate
Safety Reference
Danger
H315Causes skin irritation
H318Causes serious eye damage
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for Chromotropic acid disodium salt (CAS 129-96-4) is 2908.99.
HS code (international, 6-digit)
2908.99
EU CN code (8-digit)
2908 99 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
disodium;4,5-dihydroxynaphthalene-2,7-disulfonate
InChIKey
AFGPCIMUGMJQPD-UHFFFAOYSA-L
SMILES
C1=C2C=C(C=C(C2=C(C=C1S(=O)(=O)[O-])O)O)S(=O)(=O)[O-].[Na+].[Na+]
Synonyms (19)
- CHROMOTROPATE
- Chromogen C
- Chromotropicacidsodiumsalt
- Disodium chromotropate
- Mordant Brown 7
- Sodium chromotropate
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