Widely used as a purple dye in textiles and paper industries for coloring. Commonly employed in microbiology as a primary stain in Gram staining to differentiate bacterial types. Used in veterinary medicine to treat fungal infections in fish and as a topical antiseptic. Applied in histology for staining cell samples under microscopy. Also utilized in ink formulations for ballpoint pens and printing due to its strong color and solubility. Occasionally used in some diagnostic tests and as a pH indicator in certain conditions.