Systematic name
Chemical formula	CxHxNxOx
Molecular mass	xx.xx g/mol
Density	x.xxx g/cm3
Melting point	xx.x °C
Boiling point	xx.x °C
CAS number	*
SMILES	xxxxx
Chemical infobox

Auramine O, also called Basic yellow 2, Pyocatanium aureum, aizen auramine, Pyoktanin Yellow, Canary Yellow, Pyoktanin, or C.I. 41000, is a diarylmethane dye used as a fluorescent stain. It has the appearance of yellow needle crystals. It can be used to stain acid-fast bacteria (eg. Mycobacterium, where it binds to the mycolic acid in its cell wall) in a way similar to Ziehl-Neelsen stain. It is very soluble in water and soluble in ethanol. It can be used as a fluorescent version of Schiff reagent.

Auramine O can be used together with Rhodamine B as the Truant auramine-rhodamine stain for Mycobacterium tuberculosis. It can be also used as an antiseptic agent.

Safety

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Its risk and safety phrases are .

Diarylmethane dyes | Staining dyes | Fluorescent dyes | Antiseptics