Auramine O

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auramine O


A bright yellow crystalline solid that is used as a dye for Paper and Leather. Auramine is a ketone imine compound that was first sold under the brand name Auramine O. It has been used in the preparation of ball point pens, carbon paper, printing inks, and typewriter ribbons. It is also used as a Fungicide, Disinfectant, and Fluorochrome for biological staining. The free base, Auramine O Base (CAS 492-80-8, Solvent Yellow 34), has been removed from the market in the U.S. because it is a carcinogen. Auramine O has a mean excitation wavelength of 460 nm (blue) and a mean emission wavelength of 550 nm (Wolbers et al., 1990).

Chemical structure

Auramine O.jpg

Synonyms and Related Terms

Basic Yellow 2; CI 41000; 4,4'-(imidocarbonyl)bis(N,N-dimethylaniline); auramine hydrochloride; auramine; Solvent Yellow 34; Pigment Green 3; pyocatanium aureum; aizen auramine; pyoktanin Yellow; canary Yellow; pyoktanin


  • Toxic by ingestion, inhalation and skin absorption.
  • Possible carcinogen and mutagen.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water, ethanol, ether.

Composition C17H22ClN3
CAS 2465-27-2
Melting Point 267
Molecular Weight mol. wt. = 303.84

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993 Comment: formula= C17H22ClN3, CAS= 492-80-8
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • Aldrich Chemical Catalog
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C17H23N3, CAS= 2465-27-2

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