1/2 c Baking powder
1/4 c Baking soda
1/4 c Salt
5 lb Flour.
Add baking powder, baking soda and salt to flour. Using 2 large
bowls, sift the mixture 3 to 4 times, using the largest sifter that
you have, or use a large strainer and a wooden spoon to sift it.
Store at room temperature and use in any recipe that calls for
self-rising flour.