difference between all purpose flour and cake flour
Cake flour is a finely ground flour used in many (but not all) cake recipes. Cake flour has a lower protein content of about 8%, as compared to a 10-11% protein content in all-purpose flour. The protein is important! It helps to add structure to our cakes. The lower protein content of cake flour ensures that our cake layers have structure and a soft and light (not tough) texture.
All-purpose flour is a fine-textured flour milled from the inner part of the wheat kernel and contains neither the germ (the sprout) nor the bran (outer coating). U.S. law requires that all flours without the wheat germ have riboflavin, niacin, iron, and thiamin added. The labels call this enriched..