http://artofglutenfreebaking.com
Jeanne's Gluten-Free All-Purpose Flour Mix
Mix together and store in a cool, dark place for about 6 weeks, or in fridge for up to 4 months or in the freezer for 7 months (or even longer).
1 cup of this mix equals 145 grams.
1 1/4 cup (170 g) brown rice flour
1 1/4 cup (205 g) white rice flour
1 cup (120 g) tapioca flour
1 cup (165 g) sweet [white] rice flour (also known as "glutinous" rice flour or under the brand name, Mochiko.)
2 scant tsp. xanthan gum (scant means: "falling short of the measurement." Scant in this case means not quite 2 teaspoons. That said, don't over-think it. Just measure and move on.)