C32H24N8Na2O8S2
758.7 g/mol
Dye & PigmentWarning
ACID YELLOW 42
CAS6375-55-9EC228-940-9
Category
Dye & Pigment
Compound Class
Organic Acid
Primary Use
Acid dye for textile coloring
Acid Yellow 42 is a synthetic azo dye primarily used in textile coloring. It is a sodium salt of a bis-azo compound with sulfonate groups, contributing to its water solubility and affinity for protein fibers.
Textile dyeingColoring of wool and silk
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
SimilarStructure SimilarSimilarity 0.75
Acid Orange 56
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acid dye for textiles
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Acid dye for textile coloring
ReferenceSame Category
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direct dye for textiles
ReferenceSame Category
Ethyl pyrazolone t
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Dye intermediate
ReferenceSame Category
Acid Red 151
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synthetic acid dye
ReferenceSame Category
Fast Black K salt hemi zinc chloride
CAS64071-86-9
Dye salt for textile coloring
Referencesame scaffold
Pigment orange 13
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organic pigment for printing inks
Safety Reference
Warning
H317May cause an allergic skin reaction
H319Causes serious eye irritation
Customs Tariff Classification
The international HS code for ACID YELLOW 42 (CAS 6375-55-9) is 3204.12.
HS code (international, 6-digit)
3204.12
EU CN code (8-digit)
3204 12 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;5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]-2-sulfonatophenyl]benzenesulfonate
InChIKey
ZRYQXQUPWQNYSX-UHFFFAOYSA-L
SMILES
CC1=NN(C(=O)C1N=NC2=CC(=C(C=C2)C3=C(C=C(C=C3)N=NC4C(=NN(C4=O)C5=CC=CC=C5)C)S(=O)(=O)[O-])S(=O)(=O)[O-])C6=CC=CC=C6.[Na+].[Na+]
Synonyms (39)
- ACID YELLOW 42
- Acid Anthracene Yellow GR
- Acid Fast Yellow MR
- Acid Leather Yellow CRS
- Acid Yellow K
- Airedale Yellow 3GM
- Amacid Fast Yellow RS
- Belacid Milling Yellow R
- Benzyl Fast Yellow RS
- C.I. Acid Yellow 42
- Calcocid Milling Yellow R
- Coomassie Yellow R
- Coomassie Yellow RP
- Cyanine Fast Yellow M
- Erio Fast Yellow RL
- Fast Silk Yellow SH
- Kca Acid Milling Yellow M
- Midlon Yellow Propyl
- Milling Yellow 3J
- Milling Yellow RX
- Naphthalene Leather Yellow 2G
- Optanol Yellow R
- Pharmacine Yellow R
- Pharmatex Yellow G
- Shikiso Acid Fast Yellow MR
- Sulfonine Yellow CSR
- Sulphon Yellow RS-CF
- Suminol Milling Yellow MR
- Supranol Yellow R
- Symulon Acid Fast Yellow MR
- Tertracid Milling Yellow R
- Xylene Milling Yellow SH
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