Originally Posted by MostlyWater
cake flour is flour ground with cornstarch. you can google a way to make it yourself easily
No, not really. A substitute
for cake flour is all-purpose flour mixed with cornstarch. To substitute, add 2 tablespoons cornstarch to 3/4 cup all-purpose flour for every cup of cake flour.
Actually, cake flour is a very low protein flour (about 7%),about half that of bread flour. Cake flour is heavily-milled, which makes it finer than other flour and allows for fat to be better absorbed.