Methyl violet is a basic dye used in the textile and paper industries to provide a deep and vibrant purple color, suitable for dyeing cotton, linen, and other cellulosic fibers. It is also used as a pH indicator in analytical chemistry, particularly in acid-base titrations, where it changes color depending on the pH of the solution, typically appearing yellow in acidic conditions and violet in alkaline environments. Commonly employed in educational laboratories for demonstrating pH effects and in industrial processes where precise pH monitoring is required. Additionally, it is utilized in microbiological growth media and staining techniques to monitor metabolic changes during fermentation and to differentiate bacterial cell wall types under a microscope.