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 The heavy, oily, dark-colored liquid called tar comes from wood, coal, bones, and other organic substances. It is made by the process called destructive distillation—subjecting the materials to intense heat in the absence of air. Coal tar is the source of some fabrics, many dyestuffs, and other useful products (see Coal-Tar Products).

There are two types of wood tar—hardwood tars, derived from such trees as oak and beech; and resinous wood tars, derived from pine wood. Resinous wood tars differ from hardwood tars because they contain the pleasant smelling mixture of terpenes commonly known as turpentine. Much resinous wood tar is produced in Northern Europe, in the forests of Sweden, Finland, and Russia. This is known as Archangel or Stockholm tar, according to the source. In the United States wood-tar production is centered in the South. Because of its large creosote content, wood tar is used to preserve wood. It is also used in ointments and antiseptics.

Pitch is the black resinous substance that is obtained as a residue in the distilling of coal and wood tar, petroleum, and stearin products. Wood-tar pitch is used to make plastics, insulating materials, and caulking compounds.

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