Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Testing Status of C.I. Vat Blue 1 11168-E


CASRN: 482-89-3

Formula: C16-H10-N2-O2

Synonyms/Common Names

  • Blue 1, C.I. Vat
  • 2-(1,3-Dihydro-3-oxo-2H-indazol-2-ylidene)-1,2-dihydro-3H-indol-3-one

Known Uses

Textile dye, approved by FDA for use in sutures, originally obtained from indigo plant (Merck 1989).

Chemical Properties

Toxicity Effects (HSDB)

Special Studies

  • Absorption Disposition Metabolism Elimination (Gavage; Intravenous; Topical Application)  (S0039)  Completed 
    • Male Rats
    • Dose: IV:0.23; PO:3, 31, 305; D:1.5, 3.7 MG/KG.

Genetic Toxicology

  • Salmonella  (298321)  Completed 
    •  Equivocal 
  • Salmonella  (881598)  Completed 
    •  Positive