Ethanol (ethyl alcohol, grain alcohol, ETOH) is a clear, colorless liquid with a characteristic, agreeable odor. In dilute aqueous solution, it has a somewhat sweet flavor, but in more concentrated solutions it has a burning taste. Ethanol (CH 3CH 2OH) is made up of a group of chemical compounds whose molecules contain a hydroxyl group, -OH, bonded to a carbon atom. Ethanol made from cellulose biomass materials instead of traditional feedstocks (starch crops) is called “ bio-ethanol”. Mainly used today as a fuel additive, ethanol is also used in an 85 percent ethanol/15 percent gasoline blend, called E85.