Description

Auramine O is a synthetic, cationic yellow dye belonging to the diarylmethane class. It is valued for its strong affinity to cellulosic materials and its ability to form bright, fluorescent complexes with certain substrates. This compound is primarily utilized in specialized staining protocols within life sciences and as a colorant in specific industrial applications. Industries requiring precise biological visualization or controlled coloration are the key users of this product.

Application

• Biological Staining: Used as a fluorescent stain for acid-fast bacteria (e.g., in the Truant auramine-rhodamine stain for Mycobacterium tuberculosis) and for visualizing parasites and fungi in clinical and research microscopy.
• Textile Dyeing: Employed as a direct dye for coloring paper, silk, and cotton, providing a bright yellow hue.
• Leather Coloring: Applied in the dyeing of leather goods to achieve consistent yellow coloration.
• Ink Manufacturing: Serves as a colorant component in the production of certain printing inks and stamp pads.
• Lacquers and Coatings: Incorporated into specialty lacquers and coatings where a specific yellow pigmentation is required.
• Research Reagent: Used in biochemical and cytological research as a fluorescent probe and staining agent.

Basic Information

Product Name	Auramine O
CAS No.	2465-27-2
Molecular Formula	C17H22ClN3
Molecular Weight	303.83 g/mol
Synonyms	Basic Yellow 2; C.I. 41000; Auramine; Auramine Base O; 4,4'-Carbonimidoylbis(N,N-dimethylaniline) monohydrochloride; Tetramethyldiaminodiphenylketonimine hydrochloride; Canary Yellow; Pyoktanin Yellow
EINECS	219-567-2

Quality Control

Our Auramine O is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and performance consistency suitable for its intended applications. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming compliance with our internal specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Solubility	Soluble in water and ethanol
Absorption Maxima	432 - 436 nm (in water)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.