Ethyl violet is widely used as a biological stain in microscopy to differentiate and identify various cellular components, particularly in histology and cytology. It is effective in staining nucleic acids and proteins, making it valuable for visualizing cell structures under a microscope. In microbiology, it serves as a selective stain for Gram-positive bacteria, aiding in bacterial classification and identification. Additionally, ethyl violet is employed in the textile industry as a dye for fabrics, providing vibrant and durable coloration. It also finds application in analytical chemistry as an indicator in titration processes, helping to determine the endpoint of reactions.