Theauramine–rhodamine stain (AR), also known as theTruant auramine–rhodamine stain, is ahistological technique used to visualizeacid-fast bacilli usingfluorescence microscopy, notably species in theMycobacteriumgenus.[1] Acid-fast organisms display a reddish-yellowfluorescence.[2] Although the auramine–rhodaminestain is not asspecific for acid-fast organisms (e.g.Mycobacterium tuberculosis orNocardia) as theZiehl–Neelsen stain, it is more affordable and more sensitive, therefore it is often utilized as ascreening tool.
AR stain is a mixture ofauramine O andrhodamine B. It iscarcinogenic.
