is made from a blend of high-gluten hard wheat and low-gluten soft wheat. It’s a fine-textured flour milled from the inner part of the wheat kernel and contains neither the germ (the sprouting part) nor the bran (the outer coating). U.S. law requires that all flours not containing wheat germ must have niacin, riboflavin, thiamin and iron added. These flours are labeled "enriched." All-purpose flour comes in two basic forms bleached and unbleached that can be used interchangeably. Flour can be bleached either naturally, as it ages, or chemically. Most flour on the market today is presifted, requiring only that it be stirred, then spooned into a measuring cup and leveled off.