Erythrosin B is widely used as a red dye in the food industry, particularly in coloring candies, baked goods, and dessert toppings. It is also employed in cosmetics, such as lipsticks and blushes, to provide a vibrant red hue. In the medical field, it serves as a biological stain for microscopy, helping to highlight cellular structures. Additionally, it is utilized in dental disclosing tablets to identify plaque on teeth. Its water-soluble nature makes it suitable for use in various liquid-based applications, including inks and textiles.