New methylene blue

New methylene blue is an organic compound of the thiazine class of heterocycles. It is used as a stain and as an antimicrobial agent. It is classified as an azine dye, and the chromophore is a cation, the anion is often unspecified.
New Methylene Blue contains the word "New" in its name to differentiate the effectiveness of staining, between its predecessor methylene blue, the chemical structure of methylene blue, and the colors between the two.

Applications

NMB is a staining agent used in diagnostic cytopathology and histopathology, typically for staining immature red blood cells. It is a supravital stain. It is closely related to methylene blue, an older stain in wide use.

Safety

New methylene blue is toxic. Skin contact or inhalation should be avoided.