Normal butanol, also known as n-butanol or 1-butanol, is a four-carbon alcohol with the chemical formula C4H9OH. It is a colorless liquid that is soluble in water and has a characteristic alcoholic odor. Normal butanol is produced through the fermentation of sugars, starches, or cellulose, and is used primarily as a solvent in various industries, including chemical, pharmaceutical, and agricultural. It is also used as an intermediate in the manufacture of butyl acrylate, butyl acetate, and plasticizers, and as a fuel and fuel additive. Normal butanol can be flammable and harmful if ingested, inhaled or absorbed through the skin, and it should be handled with care and proper safety precautions.