Methyl Blue is widely used in biological and medical research as a staining agent. It helps in visualizing cellular structures under a microscope, particularly in histology to differentiate tissues and cells. In microbiology, it is employed to stain bacteria and other microorganisms for easier identification. Additionally, Methyl Blue is used in diagnostic procedures, such as the detection of amyloid proteins in tissues, aiding in the diagnosis of diseases like Alzheimer's. It also finds application in textile industries for dyeing fabrics and in analytical chemistry as an indicator in redox titrations.