Erythrosin B sodium salt is widely used as a red dye in the food and beverage industry, particularly in coloring candies, baked goods, ice cream, desserts, and drinks. It is also employed in cosmetics, such as lipsticks and blushes, to provide a vibrant red hue. In the medical and scientific fields, it serves as a biological stain for microscopy, aiding in the visualization of cellular structures and tissues. Additionally, it is utilized in dental plaque disclosure products to highlight areas of plaque buildup on teeth. It can also act as an indicator in certain chemical reactions. Its water-soluble nature makes it suitable for various applications requiring a stable and bright red color.