is made from the
endosperm: the starchy white part of the
grain. The bran is separated from the
germ and endosperm which is then refined by passing through a sieve of 80 mesh per inch (31 mesh per centimeter). Although naturally yellowish due to pigments present in wheat, is typically bleached, either naturally due to atmospheric oxygen, or with any of a number of
flour bleaching agents. While it is milled from winter wheat that has a high gluten content, heat generated during the milling process results in
denaturing of the protein, limiting its use in the preparation of leavened breads. ==Controversy==