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.]]Tar is a viscous black liquid derived from the destructive distillation
of organic matter. Most tar is produced from coal as a byproduct of coke
production, but it can also be produced from petroleum, peat or wood.
Types of tar
General The word "tar" is used to describe several distinct substances.
Naturally occurring "tar pits" (e.g. the La Brea Tar Pits in Los Angeles)
actually contain asphalt, not tar, and are more accurately known as asphalt
pits. Tar sand deposits contain various mixtures of sand (or rock) with
bitumen or heavy crude oil rather than tar, as does the Tar Tunnel in
Shropshire. "Rangoon tar", also known as "Burmese Oil" or "Burmese
Naphtha", is actually petroleum. "Tar" and "pitch " are sometimes used
interchangeably; however, pitch is considered more solid while tar is more
liquid.
Coal In English and French, "tar" is a substance primarily derived from
coal. It was formerly one
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