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Tests for Iodine

Free iodine may be recognized by - The violet color well with water, mix the clear liquids, and evaporate in a copper or lead pan, till the calcareous deposit (gypsum) becomes considerable, then cool, decant the clear, and drain the sediment on a filter; evaporate the clear liquid to the consistence of honey (say to 4 parts), add 1 part of powdered charcoal, and evaporate to dryness in an iron pot, or till the bottom of the latter becomes red hot; the dry mixture, when cold, is put into earthen retorts well covered with luting and properly dried, test tube by the heat of hot water, or add a and heat is applied sideways rather than at larger quantity to some oil of lavender, in the bottom, by means of an air furnace. The which it will dissolve spontaneously. Keep beak of the retort is connected with a copper in a close phial. tube, the other end of which is made to dip about + inch beneath the surface of lukewarm water placed in a trough or wide-mouthed bottle. The distilled product is purified by