I ran across this application in the Apple Apps store while browsing on my iPad. Looking at the developer’s website, I found that they also have applications for the iPhone.
Here’s the link:
3 cups white rice flour
3 cups tapioca starch
2 cups arrowroot starch
1 cup potato starch
3 Tbsp potato flour (optional)
Stir all ingredients together in large bowl. Store in airtight container. Use for cake, muffins and cookies. Stir or sift before use. (This flour can be substituted 1:1 for wheat flour in recipes. Add 1/2 tsp of xanthan gum per cup to each recipe).
credit Kathy Przywara from www.kidswithfoodallergies.org