Basic Fuchsin is widely used in biological staining techniques, particularly in histology and microbiology. It is a key component in the Ziehl-Neelsen stain, which is essential for identifying acid-fast bacteria like Mycobacterium tuberculosis. Additionally, it is employed in the Schiff reagent for detecting aldehydes in tissues, aiding in the visualization of polysaccharides and DNA. In dermatology, it serves as an antifungal agent in Castellani's paint, treating superficial fungal infections. Its ability to bind to specific cellular components makes it valuable in research and diagnostic applications.