Pine tar
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Pine tar is a form of wood tar produced by the high temperature carbonization of pine wood in anoxic conditions. The wood is rapidly decomposed by applying heat and pressure in a closed container; the primary resulting products are charcoal and pine tar.
Pine tar
George Brett's pine tar bat at left, from a 2006 exhibit at The Henry Ford in Dearborn, Michigan
Tar
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Tar is a dark brown or black viscous liquid of hydrocarbons and free carbon, obtained from a wide variety of organic materials through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat.
One can produce a tar-like substance from corn stalks by heating them in a microwave oven. This process is known as pyrolysis.
Tar kiln at Trollskogen in Öland, Sweden
Birch tar
A boat transporting pine tar barrels on Oulu River in 1910