Bleaching flour enhances its color and baking capabilities. The nutritional content of the flour is unaffected by this treatment. Do I have to sift if my recipe asks for it? None of the Pillsbury Best All-Purpose Since flour is sifted more than 100 times, it may be used in any recipe that asks for sifted flour. Nevertheless, the flour may have settled during transportation and storage, so it's a good idea to agitate the wheat with a fork or spoon before measuring.