Chloroform

Chloroform, or trichloromethane, is a colourless, heavy, volatile liquid historically used as a solvent, fumigant, insecticide, and anaesthetic. It is toxic and a suspected carcinogen, so it has no place as a food additive or processing aid in modern food manufacture. It can appear as a disinfection byproduct when chlorine reacts with organic matter in water, which is one reason water utilities monitor trihalomethanes in drinking supplies. Food laboratories use it only as an analytical solvent under strict safety controls, with fume extraction and waste disposal procedures that prevent any contact with foods.