Benzene, a highly flammable, clear, volatile liquid with an acrid, aromatic odor, is one of the most widely used industrial chemicals. It is a constituent by-product in gasoline, and it is used as an industrial solvent and as a chemical intermediate in the synthesis of a variety of materials. Benzene can be found in dyes, plastics, insecticides, and many other materials and products. Industries with the highest benzene usage include leather production, electronics manufacturing, machinery manufacturing and spray painting. Benzene is generally not present in household products.