This mix will make an all-purpose gluten-free blended flour. Add xanthan gum, guar gum, baking powder etc as required. Using a blended flour that you have prepared yourself is much cheaper than buying ready blended multi-purpose flour. If you shop at asian supermarkets,bulk or wholesale stores you will be able to locate all of these flours quite cheaply. The flours used in this mix are readily available in most countries and are the standard flours used in gluten-free cooking. Look for a very fine milled rice flour as the grittier flours will also produce gritty baked goods.Keep on hand to use in your recipes. Store in an airtight container. You can make larger amounts to have on hand eg. 6 cups rice flour, 2 cups potato starch & 1 cup arrowroot or tapioca flour. The potato starch/flour that you are looking for is a fine white powder (not the US potato flour). The general recommended amounts of xanthan gum are 1/2 to 1 teaspoon for a cake, 1 teaspoon for a pastry recipe and 1 tablespoon for a bread recipe. Add the gum to your dry ingredients and mix well, prior to adding liquids. This is a general purpose flour blend. You can also replace 1 cup of rice flour with 1 cup of brown rice flour. Editted to add - Yes..this recipe uses potato starch. In Australia we cannot purchase potato flour as is available in the US. Potato starch is sold as both potato flour and potato starch in Australia