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Acid Violet 3

CAS 1681-60-3

2,7-Naphthalenedisulfonic acid, 3-[2-(4-aminophenyl)diazenyl]-4,5-dihydroxy-, sodium salt (1:2)

EPA and Census publish no US supply data for this chemical.

Molecular structure of 1681-60-3
2 Na⁺
US productionNot reported
Top sourceNo public record

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Where It Comes From

EPA and Census publish no US supply data for this chemical.

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS1681-60-3
PubChem CIDNot recorded
DTXSIDDTXSID4061880
FormulaC16H11N3Na2O8S2
Mol. Weight483.38 g/mol
SMILES[Na+].[Na+].NC1=CC=C(C=C1)N=NC1=C(C=C2C=C(C=C(O)C2=C1O)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

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Brief citations

Acid Violet 3 (CAS 1681-60-3) https://chemicalindependence.com/chemical/1681-60-3/ EPA TSCA Inventory: CAS 1681-60-3. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory