ZIEHL NEELSEN (ZN) ACID FAST STAIN KIT · ZN staining kit is a special bacteriological staining kit used to identify organisms, mainly Mycobacteria. Mycobacterium tuberculosis is the most important of this group because it is responsible for tuberculosis. Kit consist of Carbol fuchsin solution (500ml), Decolorizer solution (500ml) and Methylene blue counter stain (500ml). Volume : 500mlx3