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To Purify Glycerine (Commercial glycerine)

Commercial glycerine is rendered pure by diluting it with water; it is then decolored with a little animal charcoal (see No. 1729), filtered, and evaporated to the consistence of a thin syrup, after which it is further evaporated in a one-half, when a very nutritious jelly is obin a one-half, when a very nutritious jelly is obvacuum, or over sulphuric acid, until it ac- tained. A copper vessel should not be used, quires a specific gravity of 1.265.