Any substance which changes the characteristics of the food when added is known as food additives. Additives which are added for specific purpose in the food are known as direct additives for e.g. salt and those which are added for package, handling or storing of food are known as indirect additives. Additives are mainly used to maintain and improve safety of the packaged food and to enhance the nutritional value of the food. It is also used to improve the taste, appearance, texture and consistency of the food.