Charcoal is the charcoal clay mask black carbon and ash residue hydrocarbon produced by removing water and other volatile constituents from animal and vegetation substances. This section needs additional citations for verification.
Historically, the production of wood charcoal in locations where there is an abundance of wood dates back to a very ancient period, and generally consists of piling billets of wood on their ends so as to form a conical pile, openings being left at the bottom to admit air, with a central shaft to serve as a flue. An abandoned charcoal kiln near Walker, Arizona, USA. In Finland and Scandinavia, the charcoal was considered the by-product of wood tar production. The best tar came from pine, thus pinewoods were cut down for tar pyrolysis.
The charcoal briquette was first invented and patented by Ellsworth B. Zwoyer of Pennsylvania in 1897 and was produced by the Zwoyer Fuel Company. Charcoal has been made by various methods. The traditional method in Britain used a clamp. The chimney consists of 4 wooden stakes held up by some rope. The logs are completely covered with soil and straw allowing no air to enter. Modern methods employ retorting technology, in which process heat is recovered from, and solely provided by, the combustion of gas released during carbonisation.