This product is an acid fast stain consisting of auramine O, rhodamine B, phenol, glycerine and reagent alcohol in water. Auramine O/Rhodamine fluorescent stain is used to stain acid fast bacteria. The staining procedure also requires fluorescent decolorizer (catalog # AAD) and 0.5% potassium permanganate (catalog # PPC-1). The solution is Manufactured in the United States by Medical Chemical Corp.