Certain food additives are in the list of banned food additives because of many reasons and one of these is the hazard it presents to the consumer in the form of allergies and reactions. In the safety measures the amount of food additive to be consumed is specified scientifically. But if the food additive is considered hazardous even at the recommended quantity then it is considered as a banned food additive.
You will not find the list of banned food additives as it will create negative impact on the food additive industry as a whole. Because of this reason the list of permitted food additive is published. Any accepted food additive is permitted on the basis of its increasing the shelf value of food, ability to maintain the food's nutritional value, ability to increase its appeal etc.