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 diseases. Used in veterinary medicine to treat certain infections in livestock. Serves as an indicator in analytical chemistry due to its distinct color change under different pH conditions. Also utilized in the development of inks, including printer and ballpoint pen inks, for its vibrant hue and solubility.