Tartrazine is a synthetic yellow dye commonly used in food products, beverages, and cosmetics. It is known for its bright yellow color and is often found in items like candies, soft drinks, and processed foods. Tartrazine is identified by its E number, E102, in the European Union. This dye is derived from coal tar and is water-soluble, making it easy to incorporate into various products. While generally recognized as safe, some individuals may experience allergic reactions or sensitivities to tartrazine, leading to regulations in its use in certain countries.