Rice flour (also rice powder) is a form of flour made from finely milled rice. It is distinct from rice starch, which is usually produced by steeping rice in lye. Rice flour is a common substitute for wheat flour. It is also used as a thickening agent in recipes that are refrigerated or frozen since it inhibits liquid separation. Rice flour may be made from either white rice or brown rice. To make the flour, the husk of rice or paddy is removed and raw rice is obtained, which is then ground to flour. Rice contains a few sun-protecting agents like ferulic acid and allantoin, which convert it into a good natural sunscreen. Being a good anti-inflammatory agent, rice powder also soothes sunburns and prevents the skin from sun tan.