This gluten-free flour, also know as rice powder, is made from finely milled rice. It can be found in both white rice and brown rice forms, and it’s a staple food in Southeast Asia, Japan and southern India.Rice flour is a great substitute for wheat flour, since most wheat flour contains gluten — a protein that can irritate the digestive system or worse for anyone who is gluten intolerant. Rice flour is a popular thickening agent because it has the ability to prevent liquid separation.