C18H13N4NaO7S
452.4 g/mol
Dye & PigmentDanger
Acid Orange 3
CAS6373-74-6EC228-921-5
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
dye for wool, nylon, silk, and leather
Acid Orange 3 is an azo dye used for coloring wool, nylon, silk, and leather. It is distinct from methyl orange, which is a pH indicator used in titrations.
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
Safety Reference
Danger
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for Acid Orange 3 (CAS 6373-74-6) 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
sodium 2-anilino-5-(2,4-dinitroanilino)benzenesulfonate
InChIKey
KKBFCPLWFWQNFB-UHFFFAOYSA-M
SMILES
C1=CC=C(C=C1)NC2=C(C=C(C=C2)NC3=C(C=C(C=C3)[N+](=O)[O-])[N+](=O)[O-])S(=O)(=O)[O-].[Na+]
Synonyms (59)
- Acid Fast Yellow AG
- Acid Fast Yellow E5R
- Acid Leather Light Brown G
- Acid Orange 3
- Acid Orange No. 3
- Acid Yellow E
- Airedale Yellow E
- Amido Yellow E
- Amido Yellow EA-CF
- Amido yellow EA
- Anthralan Yellow RRT
- C.I. Acid Orange 3
- Coranil Brown H EPS
- Derma FUR Yellow RT
- Derma Yellow P
- Dimacide Yellow N-5RL
- Duasyn Acid Yellow RRT
- Elbenyl Orange A-3RD
- Erio Fast Yellow AE
- Erio Fast Yellow AEN
- Erio Yellow AEN
- Erionyl Yellow E-aen
- Fast Light Yellow E
- Fenalan Yellow E
- Heliacid Light Yellow 4R
- Intranyl Orange T-4R
- Kiton Fast Yellow A
- Lanaperl Yellow Brown GT
- Light Fast Yellow ES
- Lissamine Fast Yellow AE
- Lissamine Fast Yellow AES
- Lissamine Yellow AE
- Multacid Yellow 3R
- Multicuer Brown MPH
- Nailamide Yellow Brown E-L
- Nylocrom Yellow 3R
- Nylomine Acid Yellow B-RD
- Nylosan Yellow E-3R
- Polan Yellow E-3R
- Sellacid Yellow AEN
- Solanile Yellow E
- Sulfacid Light Yellow 5RL
- Superian Yellow R
- Tectilon Orange 3GT
- Tertracid Light Yellow 2R
- Unitertracid Light Yellow RR
- Vondacid Fast Yellow AE
- Vondacid Light Yellow AE
- Xylene Fast Yellow ES
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