Seeds of terumah: when he collects them, they are forbidden; but if he discards them, they are permitted. So too the bones of sacrifices: when he collects them, they are forbidden; but if he discards them, they are permitted.  Coarse bran is permit-ted. Bran of new [wheat] is forbidden, and of old [wheat] is permitted. And he conducts himself with terumah the same way he conducts himself with chullin. Someone who sifts flour [and retains] a kav or two kav per seah should not destroy the remainder, but should place it in a protected place.