iodide of sulphur

Chem.: S212. A dark gray crystalline ma , resembling native antimony sulphide, prepared by heating a mixture of sulphur and iodine. It is insoluble in water, gives off iodine when exposed to the air, and is rapidly decomposed when exposed to a high temperature. It is a powerful remedy in skin diseases. pine, pit, sire, sir, marine; gō, pot, iodine I-o-dine, s. [ Gr.iodes =violet-colored; Eng. suff. ine.] 1. Chem.: Iodine is a haloid monatomic element; symbol I; atomic weight 127. Obtained from the ash of sea-weeds called kelp; this is treated with water, filtered and evaporated to a small bulk; pota ium and sodium salts crystallize out and the dark-brown mother liquid is then mixed with sul phuric acid and manganese dioxide, and, gently heated in a still, the iodine distills over and is collected in a receiver. 2HI+MOHSO4=MnSO4+2H2O+I2. The iodine of commerce is generally impure; it may be purified by di olving it in a solution of pota ium iodide till it is saturated, adding water which precipitates pure iodine. Iodine crystallizes in dark gray rhombic crystals, having a metallic luster resembling graphite; specific gravity 4.95. It melts at 107° and boils at 175°. Its vapor is of a deep blue color; when le dense it has a violet color. Iodine di olves in 7000 parts of water; it is soluble in alcohol, ether, chloroform, and in carbon disulphide. Iodine stains the skin brown, and is soluble in pota ium iodide. At ordinary temperatures iodine is slightly volatile, and has a peculiar smell. A small trace of iodine can be detected by its giving a blue color to starch. The blue color is destroyed by heat but reappears on cooling. Iodine unites with other elements and radicals, forming iodides. Its affinity for oxygen is greater than that of chlorine, but it has a le affinity for hydrogen, hence hydriodic acid is easily decomposed by chlorine. 2. Phar .: Iodine is used externally in chronic skin diseases and over enlarged and indurated parts and diseased joints to alter action or cause absorption, or to kill parasites. It may be applied in the form of a liniment, a solution, a tincture, or an ointment. As a vesicant the liniment may be painted over the part once, or, if need be, twice or three times. The vapor iodi (vapor of iodine) may be used as an inhalation in some forms of chronic bronchitis and phthisis. ( Garrod .) 3. Comp . Anat . , & c.: A solution of iodine is useful for rendering very transparent objects more distinct. i-ô-dīze, v. t. [Eng. iod (ine); -ize.] of iodine. 1. Therap .: To treat with inhalations or external applications of iodine; to place under the influence 2. Photog .: To prepare with iodine. [IODIZED.] i-o-dized, pa . par . & a. [IODIZE.]