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40d:Refined coal
Fuel is used to power high-temperature industries, namely metalworking and glassworking. One unit of fuel is required for every task at a smelter, metalsmith's forge, kiln, or glass furnace.
Fuel can be created by converting wood into charcoal at the wood furnace, or by refining coke from bituminous coal or lignite at the smelter.
Charcoal
- Required Building - Wood furnace
- Required Material - Wood
- Required Skill - Wood burning
- Used as fuel
Charcoal is a fuel used to power the Smelter, Metalsmith's forge and glass furnace. One charcoal (or coke) is required for each operation at either, unless you are using a magma-powered furnace. It can be created at a wood furnace using one wood log by a dwarf with the Wood Burning skill on.
Coke
Coke is a type of fuel used to fuel non-magma furnaces. It is created at the smelter from bituminous coal, yielding 3 coke, and lignite, yielding 2.
Veins of lignite and bituminous coal will be ignited by magma, destroying the whole thing in a raging inferno.