Widely used as a purple dye in textiles and paper industries due to its strong color and affinity for cellulose-based materials. Commonly employed in microscopy as a staining agent to visualize cells and tissues, particularly in Gram staining to differentiate bacterial types. Acts as an antifungal and antiparasitic agent in aquaculture, helping control infections in fish. Utilized in some ink formulations for writing and printing purposes because of its vibrant hue and stability. Also applied in analytical chemistry as a pH indicator and in the detection of certain ions. Has been explored for its potential in photodynamic therapy due to light-sensitive properties.