Methyl Green is a synthetic dye and a cationic dye that is commonly used in histology and microscopy. It belongs to the class of triarylmethane dyes and is known for its ability to selectively stain nucleic acids, particularly DNA. Methyl Green is often used in combination with other dyes, such as pyronin, to achieve differential staining of biological specimens. In histology, it is employed to stain cell nuclei, allowing for the visualization of cellular structures and tissues under a microscope. Due to its specificity for nucleic acids, Methyl Green has found applications in various biological and medical research studies.

In addition to its use in histology and microscopy, Methyl Green has also been explored for its potential therapeutic applications. Some research has suggested that it may have antiviral properties and could be useful in the development of antiviral drugs. However, further studies and clinical trials are needed to fully understand its pharmacological effects.