C.I. Direct Black 19, disodium salt

CAS 6428-31-5

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

Molecular structure of 6428-31-5 — 2 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 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.

Where It Comes From

EPA reports by year

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

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.

Orient Corporation Of America

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.

•Pigment in Printing Ink ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Dye in Printing Ink ManufacturingNot Known or Reasonably Ascertainable
•Dye in Synthetic Dye and Pigment Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS6428-31-5

PubChem CID101697935

DTXSIDDTXSID3064356

FormulaC34H27N13Na2O7S2

Mol. Weight839.8 g/mol

SMILESC1=CC(=CC=C1N=NC2=C(C=C(C=C2)N)N)N=NC3=C(C4=C(C(=C(C=C4C=C3S(=O)(=O)[O-])S(=O)(=O)O)N=NC5=CC=C(C=C5)N=NC6=C(C=C(C=C6)N)N)[O-])N.[Na+].[Na+]

Data Sources

EPA CompTox (DSSTox) · DTXSID3064356Retrieved 2026-04-06
PubChem · compound 101697935Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

C.I. Direct Black 19, disodium salt (CAS 6428-31-5) https://chemicalindependence.com/chemical/6428-31-5/ EPA CompTox (DSSTox): DTXSID3064356. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3064356 PubChem: 101697935. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/101697935 EPA Chemical Data Reporting: 6428-31-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 6428-31-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting