C.I. Acid Brown 311
CAS 72207-77-3
Iron, complexes with diazotized 4-nitrobenzenamine, diazotized sodium 3-aminobenzenesulfonate (1:1) and diazotized sodium 5-amino-2-(phenylamino)benzenesulfonate (1:1) coupled with 4-[2-(2-hydroxy-3,5-dinitrophenyl)diazenyl]-1,3-benzenediol
EPA and Census publish no US supply data for this chemical.
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 unknownWhere 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
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
C.I. Acid Brown 311 (CAS 72207-77-3) https://chemicalindependence.com/chemical/72207-77-3/ EPA TSCA Inventory: CAS 72207-77-3. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory