Creosote

Creosote, complex mixture of various phenols and phenolic ethers obtained from the dry distillation of wood. When pure, creosote is a colorless, transparent liquid slightly heavier than water and with a pungent odor. Usually it varies in color from yellow to black because of the presence of impurities. Creosote can act as an antiseptic and was formerly used in the treatment of chest infections. The flavoring and preserving of smoked meats are accomplished through the presence of small amounts of creosote in the smoke. Creosote oil, also frequently called creosote, is a similar mixture obtained from the distillation of coal and blast-furnace tar. It has been used as a wood preservative to impregnate railroad ties, telephone poles, pilings, and other outdoor wooden structures.