No article of food shall contain any food additive or processing aid unless it is in accordance with the provisions of this Act and regulations made thereunder.
     Explanation. - For the purposes of this section, "processing aid" means any substance or material, not including apparatus or utensils, and not consumed as a food ingredient by itself, used in the processing of raw materials, foods or its ingredients to fulfil a certain technological purpose during treatment or processing and which may result in the non-intentional but unavoidable presence of residues or derivatives in the final product.