Creosote name is derived . The two main kinds recognized in industry are coal-tar creosote and wood-tar creosote. The coal-tar variety, having stronger and more toxic properties, has chiefly been used as a preservative for wood; coal-tar creosote was also formerly used as an escharotic, to burn malignant skin tissue, and in dentistry, to prevent necrosis, before its carcinogenic properties became known. The wood-tar variety has been used for meat preservation, ship treatment, and such medical purposes as an anaesthetic, antiseptic, astringent, expectorant, and laxative, though these have mostly been replaced by modern formulations. Varieties of creosote have also been made
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