C.I. Direct Red 81 disodium salt

CAS 2610-11-9

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

Molecular structure of 2610-11-9 — 2 Na⁺

US productionCBI

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

Import value, 2024$18M

Top sourceIndia 41%

At least one company claimed its 2023 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: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 320414 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 320414, which covers 36 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

IN 41%IndiaMX 33%MexicoJP 8%JapanDE 6%GermanyTW 3%Taiwan

Malaysia
Italy
Canada
Czech Republic
Finland
Sweden
Australia
Brazil
Georgia
Switzerland

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.

Sensient Colors

Why It Matters

Sectors

TextilesPaper & Printing

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

Used in 2 sectors as 2 functional roles.

•Dye in Synthetic Dye and Pigment ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Pigment in Printing Ink Manufacturing (0%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.58/gAaron Chemicals LLC

CountryHong Kong

Pack$291.00 / 500 g

Purity99%

Vendors4 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

3 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$1.14	500 g	—
Sigma-Aldrich (Rush Stock)	Germany	$2.13	100 g	—
Sigma-Aldrich	Germany	$2.13	100 g	—

Chemical Identity

CAS2610-11-9

PubChem CID17462

DTXSIDDTXSID5041726

FormulaC29H19N5Na2O8S2

Mol. Weight675.6 g/mol

SMILESC1=CC=C(C=C1)C(=O)NC2=CC3=CC(=C(C(=C3C=C2)O)N=NC4=CC=C(C=C4)N=NC5=CC=C(C=C5)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]

Data Sources

EPA CompTox (DSSTox) · DTXSID5041726Retrieved 2026-04-06
PubChem · compound 17462Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

C.I. Direct Red 81 disodium salt (CAS 2610-11-9) https://chemicalindependence.com/chemical/2610-11-9/ EPA CompTox (DSSTox): DTXSID5041726. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5041726 PubChem: 17462. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/17462 EPA Chemical Data Reporting: 2610-11-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 2610-11-9. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 320414 for CAS 2610-11-9. Reporting year: 2024. https://usatrade.census.gov/