E151, also known as Black BN, is a synthetic food coloring used in various food products. It is derived from coal tar and is primarily used to enhance the appearance of foods, giving them a darker hue. Common applications include candies, sauces, and processed foods. The use of E151 is regulated in many countries due to health concerns. Some studies have suggested potential links to hyperactivity in children and other health issues. As a result, certain regions, including the European Union, have restrictions on its use, while others allow it under specific guidelines.