C.I. Acid Blue 324

CAS 70571-81-2

U.S. production volumes are classified as confidential business information.

Molecular structure of 70571-81-2 — 1 Na⁺

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceNo public record

At least one company claimed its 2019 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2019.

Where It Comes From

EPA reports by year

2023: US production Not published · Imports Not published
2019: US production Confidential · Imports Confidential

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Dystar

EPA-registered importers (1)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Huntsman

Why It Matters

Sectors

Textiles

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Dye in Textiles, apparel, and leather manufacturing (0%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS70571-81-2

PubChem CID23673673

DTXSIDDTXSID4036485

FormulaC22H16N3NaO6S

Mol. Weight473.4 g/mol

SMILESCC(=O)NC1=CC=CC(=C1)NC2=CC(=C(C3=C2C(=O)C4=CC=CC=C4C3=O)N)S(=O)(=O)[O-].[Na+]

Data Sources

EPA CompTox (DSSTox) · DTXSID4036485Retrieved 2026-04-06
PubChem · compound 23673673Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

C.I. Acid Blue 324 (CAS 70571-81-2) https://chemicalindependence.com/chemical/70571-81-2/ EPA CompTox (DSSTox): DTXSID4036485. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID4036485 PubChem: 23673673. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/23673673 EPA Chemical Data Reporting: 70571-81-2. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 70571-81-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting