All-Purpose Flour #4 (Gluten-Free)

This recipe comes to us from Cory Bates.
The formulation is as follows:
White Rice Flour 32%
Brown Rice Flour 32%
Potato Starch (not pot. flour) 15%
Tapioca Flour 12%
Corn Starch 6%
Xanthan Gum 3%
For a general guideline of how to mix the flour, the following recipe can be followed. Yields 2 - 2.5 lbs. of flour mix.
Brown Rice Flour 2 ½ Cups
White Rice Flour 2 Cups
Corn Starch ½ Cup
Potato Starch ¾ cup + 2 Tablespoons
Tapioca Flour or Starch ¾ cup + 2 Tablespoons
Xanthan gum 3 Tablespoons

1 part bean flour
1 part brown rice (or 1 part white rice flour)
1 part corn starch
1 part tapioca starch
½ to ¾ parts sweet rice flour

1 part bean flour
1 part corn starch or arrowroot powder
1 part tapioca flour

The following two formulations were created by Cory Bates.
Formulation 1:
White Rice Flour 32%
Brown Rice Flour 32%
Potato Starch 15%
Tapioca Flour 12%
Corn Starch 6%
Xanthan Gum 3%

Formulation 2:
White Rice Flour 23%
Brown Rice Flour 23%
Garbanzo Bean Flour 18%
Potato Starch 15%
Tapioca Flour 12%
Corn Starch 6%
Xanthan Gum 3%