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Direct Black 38

直接黑38

Also known as: Chlorazol Black E, Azo Black, C.I. Direct Black 38, C.I. 30235, Erie Black, Pontamine Black E

Direct Black 38 (CAS 1937-37-7) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C34H25N9Na2O7S2 and a molecular weight of 781.728 g/mol. It is also known as Chlorazol Black E, Azo Black and C.I. Direct Black 38. Key properties include a melting point of 109-110°C and a density of 1.61g/cm3. It is classified under GHS with signal word Danger and hazard statements H319 — Causes serious eye irritation and H350 — May cause cancer. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
1937-37-7
Jingsj CID
J-3543-5
Molecular Formula
C34H25N9Na2O7S2
Chinese Name
直接黑38
Molecular Weight
781.728 g/mol
Category
Organic Compounds
Last updated
8/21/2026

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Physicochemical Properties

Melting Point109-110°C
Density1.61g/cm3
Exact Mass781.111389
PSA303.61000
LogP11.91860
Refractive Index1.768

GHS Safety & Compliance

Irritant / Health HazardSignal word: Danger
  • H319 — Causes serious eye irritation
  • H350 — May cause cancer

Activity & Biological Data

Additional Information[1]. Beije B. Induction of unscheduled DNA synthesis in liver and micronucleus in bone marrow of rats exposed in vivo to the benzidine-derived azo dye, Direct Black 38. Mutat Res. 1987 Apr;187(4):227-34.

Frequently Asked Questions

What is the CAS number of Direct Black 38?

The CAS number of Direct Black 38 is 1937-37-7.

What are the molecular formula and molecular weight of Direct Black 38?

Direct Black 38 has molecular formula C34H25N9Na2O7S2 and molecular weight 781.728 g/mol.

Is Direct Black 38 hazardous?

Direct Black 38 has GHS signal word Danger and hazard statements H319 — Causes serious eye irritation; H350 — May cause cancer.

Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Direct Black 38 (CAS 1937-37-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-3543-5 (accessed 2026-10-28).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.