Creosote from both oil shale and petroleum, and are known as oil-tar creosote when derived from oil tar, and as water-gas-tar creosote when derived from the tar of water gas. Creosote also has been made from pre-coal formations such as lignite, yielding lignite-tar creosote, and peat, yielding peat-tar creosote. The term creosote has a broad range of definitions depending on the origin of the coal tar oil and end use of the material. With respect to wood preservatives, the United States Environmental Protection Agency (EPA) considers the term creosote to mean a pesticide for use as a wood preservative meeting the
Picoline its unpleasant smell. In 1849, the Scottish chemist Thomas Anderson (1819 – 1874) prepared picoline in pure form, from coal tar and via the pyrolysis of bones. Anderson also named picoline by combining the Latin words "pix" (tar) and "oleum" (oil) because coal tar oil was a source of picoline. By 1870, the German chemist Adolf von Baeyer had synthesized picoline in two ways: by the dry distillation of "acroleïnammoniak" (CH=CH-CH=N-CHOH-CH=CH) and by heating "tribromallyl" (1,2,3-tribromopropane) with ammonia in ethanol. In 1871, the English chemist and physicist James Dewar speculated that picoline was methylpyridine. If the structure of pyridine that