Erythrosin B sodium salt is widely used as a red dye in various industries. In the food sector, it is employed as a color additive in products like candies, baked goods, and desserts to enhance their visual appeal. In pharmaceuticals, it is utilized in tablet coatings and liquid medications to provide a distinctive color for easy identification. The dye is also used in cosmetics, particularly in lipsticks and blushes, to achieve vibrant shades. Additionally, it serves as a biological stain in microscopy to highlight specific cellular structures or tissues. Its water-soluble nature and bright coloration make it a versatile choice for these applications.