Functions of Food Additives 5. Colors –Give foods a desired, appetizing or characteristic color. Carmel Beta-apo-8-Carotenal (Orange) Citrus Red FD&C Blue No 1 FD&C Red No 3 FD&C Yellow No 5Functions of Food Additives 5. Colors –Give foods a desired, appetizing or characteristic color. Carmel Beta-apo-8-Carotenal (Orange) Citrus Red FD&C Blue No 1 FD&C Red No 3 FD&C Yellow No 5