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Sugar-Charcoal prepared by heating pure, white, ashless sugar, preferably in a platinum capsule, until combustion of volatile matter ceases, forms a black, shining, porous mass, which, however, contains "organic" impurities that cannot be eliminated by ignition alone. It is consequently heated in a current of dry chlorine at 1000° C. for several hours, then washed with hot water, and again ignited in dry hydrogen till hydrogen chloride ceases to be evolved. The density of purified sugar-charcoal is 1.8, and its ignition temperature about 450° C.

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