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material does not turn to ash, as in a conventional fire, but decomposes to form charcoal. the most common variety of charcoal, wood charcoal, was formerly prepared by piling wood into stacks, covering it with earth or turf, and setting it on fire. in this process volatile compounds in the wood (e.g., water
principal ingredient in sumi-e, a form of japanese ink painting that uses only black ink in various concentrations. because of its porous structure, finely divided charcoal is a highly efficient agent for filtering the adsorption of gases and of solids from solution. it is used in sugar refining, in water...
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