E103 is a food additive known as "Brilliant Blue FCF," primarily used as a colorant in various food products. It is a synthetic dye that gives a bright blue hue to items like candies, beverages, and baked goods. E103 is approved for use in many countries, but its safety is monitored by regulatory agencies. This additive is part of a larger group of colorants, which includes other codes like E100 (Curcumin) and E120 (Carmine). While E103 is generally recognized as safe, some individuals may have sensitivities or allergies to synthetic dyes, prompting ongoing discussions about their use in food.