C.I. Leuco Sulphur Black 1

CAS 66241-11-0

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

US productionCBI

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

Import value, 2024$52M

Top sourceIndia 34%

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. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 320419 · basket

EPA reports by year

2019: US production Confidential · Imports Confidential

These shares come from HS customs code 320419, 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 34%IndiaCN 14%ChinaJP 13%JapanDE 12%GermanyCA 7%Canada

South Korea
Switzerland
Colombia
Spain
Belgium
Hong Kong
Czech Republic
Australia
Israel
Ukraine
Poland
Malaysia
North Macedonia
Turkey
Russia
Yemen
Singapore
Brazil

EPA-registered importers (2)

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

Archroma Management Gmbh · CH Switzerland

Archroma U.S

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

Used in 2 sectors as 1 functional role.

•Dye in Textiles, apparel, and leather manufacturing (100%)Processing—incorporation into article
•Dye in Synthetic Dye and Pigment Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS66241-11-0

PubChem CIDNot recorded

DTXSIDDTXSID5028299

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID5028299Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · 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. Leuco Sulphur Black 1 (CAS 66241-11-0) https://chemicalindependence.com/chemical/66241-11-0/ EPA CompTox (DSSTox): DTXSID5028299. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5028299 EPA Chemical Data Reporting: 66241-11-0. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 66241-11-0. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 320419 for CAS 66241-11-0. Reporting year: 2024. https://usatrade.census.gov/