(Gr. iodes, violet) Discovered by Courtois in 1811. Found in compounds in sea water, assimilated by seaweed, Chilean saltpeter, caliche, old salt brines, salt wells.
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halogen, solid at room temp., bluish-black, sublimes to violet vapor with an irritating odor, only slightly soluble in water
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used as a disinfectant, added to table salt for nutrition, silver iodide used in photosensitive film, skin antiseptic, deep blue color in a starch solution is a sign of the free element