Used as a biological stain in microscopy to differentiate between gram-positive and gram-negative bacteria during Gram staining procedures. Employed in histology for staining cell structures, enabling clear visualization of tissues and cells under the microscope. Acts as an indicator in analytical chemistry due to its distinct color change under different pH conditions. Utilized in the textile industry for dyeing cotton, silk, and wool, providing a strong violet color. Applied in aquaculture as an antifungal and antiparasitic agent to treat fish eggs and control infections in fish. Used in some ink formulations, particularly for printing and writing inks, due to its intense color and solubility. Serves as a component in the preparation of other dyes and dye intermediates in the chemical manufacturing industry.