Rice flour is finely ground, uncooked rice. DO NOT purchase regular flour, you will not get the same results. Regular flour is too fine and will not exfoliate the skin, rice flour still has texture and very fine beads.
Rice flour is very similar to Dermalogica's Daily Microfoliant, texture wise. In fact rice flour is one of the main ingredients used. Rice flour has a very soft, fine texture to it. Gentle enough to use everyday. Rice flour works well because it is anti-inflammatory and it contains antioxidants.
To use rice flour as a scrub use less than a tea spoon worth, you need to wet it first before you apply it to clean skin. Keep it in the palm of your hand and run it under warm water. Don't add too much water, this will turn into a paste, if it is too thick then add more water. Begin to exfoliate your skin in upward circles for about 60 seconds (can be left on for 5-10 minutes, if used as a mask). Rinse with cool or warm water and continue with routine.
I purchased Bob's Red Mill white rice flour. This is a 24 oz. bag (that will last forever) that was under $6 at Von's. This is a huge bargain, most exfoliants are 6-8 oz with a price tag of $5-$50!