Erythrosin B is widely used as a red dye in the food industry, particularly in coloring candies, baked goods, and canned fruits. It is also employed in cosmetics, such as lipsticks and blushes, to provide a vibrant red hue. In the pharmaceutical sector, it is utilized as a coloring agent in tablets and capsules for easy identification. Additionally, Erythrosin B finds application in biological staining, where it helps in visualizing cellular structures under a microscope. Its ability to absorb light makes it useful in photodynamic therapy for treating certain medical conditions. In dentistry, it is used in disclosing tablets to highlight plaque on teeth for better oral hygiene management.