Patent Blue V is widely used as a dye in the food industry, particularly for coloring beverages, candies, and desserts, giving them a bright blue appearance. In the medical field, it serves as a vital staining agent in diagnostic procedures, such as sentinel lymph node mapping, where it helps identify lymph nodes during surgeries. Additionally, it is employed in cosmetics, including shampoos and soaps, to provide a distinctive blue color. Its use in textile dyeing is also notable, where it imparts vibrant hues to fabrics. However, its application is regulated in some regions due to potential allergenic effects.