Used as a biological stain in microscopy to highlight cellular components, particularly in histology and cytology. It helps differentiate tissues and cells under a microscope. Applied in medical diagnostics to detect certain conditions, such as identifying amyloid fibrils in tissues. Utilized in textile industries as a dye for coloring fabrics, especially cotton and silk. Sometimes employed in environmental studies to trace water flow and detect leaks in systems due to its visible staining properties. Also serves as an indicator in chemical reactions, particularly in redox titrations, to signal endpoint changes.