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. Acts as an antifungal and antiparasitic agent in aquaculture, particularly for treating fish and fish eggs. Used in some ink formulations for writing and printing. Applied in histology for staining cell samples under microscopy. Also utilized in the development of colorimetric sensors and as a pH indicator in certain analytical methods. In some cases, it is used as an antibacterial and antifungal agent in traditional medicine, but caution is advised due to potential toxicity if absorbed into the body in large amounts.