Coke (fuel)
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Coke is a manmade fuel, consisting of almost pure carbon.
Traditional feed stocks for coke have been coal or petroleum. The feed stock is heated in air-tight containers, to separate the carbon from the volatile elements.
Coke burns very hot, and its flame does not introduce any other impurities into the product being heated than carbon. In working with iron and steel, introducing carbon is a desirable side effect, as when case hardening.