 At least one flour labeled "unbleached cake flour blend" (marketed by King Arthur Flour) is not bleached, but the protein content is much higher than typical cake flour at about 9.4% protein (cake flour is usually around 6% to 8%).According to King Arthur, this flour is a blend of a more finely milled unbleached wheat flour and cornstarch, which makes a better end result than unbleached wheat flour alone (cornstarch blended with all-purpose flour is commonly substituted for cake flour when the latter is unavailable).The end product, however, is denser than would result from lower-protein, chlorinated cake flour.