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C.I. Direct Black 38

CAS 1937-37-7

2,7-Naphthalenedisulfonic acid, 4-amino-3-[2-[4'-[2-(2,4-diaminophenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-5-hydroxy-6-(2-phenyldiazenyl)-, sodium salt (1:2)

Molecular structure of 1937-37-7
2 Na⁺
US productionNot reported
Import value, 2024$18M
Top sourceIndia 41%

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 unknown

Production is reported production, not a complete census of factories. 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

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

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS1937-37-7
PubChem CIDNot recorded
DTXSIDDTXSID7020184
FormulaC34H25N9Na2O7S2
Mol. Weight781.73 g/mol
SMILES[Na+].[Na+].NC1=CC(N)=C(C=C1)N=NC1=CC=C(C=C1)C1=CC=C(C=C1)N=NC1=C(C=C2C=C(C(N=NC3=CC=CC=C3)=C(O)C2=C1N)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

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Brief citations

C.I. Direct Black 38 (CAS 1937-37-7) https://chemicalindependence.com/chemical/1937-37-7/ EPA TSCA Inventory: CAS 1937-37-7. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 320414 for CAS 1937-37-7. Reporting year: 2024. https://usatrade.census.gov/