Iodine--iodide Of Potassium





=Iodine= occurs in scales of a dark bluish-black colour. It strikes blue

with solution of starch, and stains the skin and intestines

yellowish-brown. Liquid preparations, as the liniment or tincture, may

be taken accidentally or suicidally.



Symptoms.--Acrid taste, tightness of throat, epigastric pain, and then

symptoms of irritant poisons generally. Chronic poisoning (iodism) is

characterized by coryza, salivation, and lachrymation, frontal headache,

loss of appetite, marked mental depression, acne of the face and chest,

and a petechial eruption on the limbs.



Post-Mortem Appearances.--Those of irritant poisoning with corrosion,

and staining of a dark brown or yellow colour.



Treatment.--Stomach-pump and emetics, carbonate of sodium, amylaceous

fluids, gruel, arrowroot, starch, etc.



Analysis of Organic Mixture containing Iodine.--Add bisulphide of

carbon, and shake. The iodine may be obtained on evaporation as a

sublimate. It will be recognized by the blue colour which it gives with

starch.



=Iodide of Potassium.=--Colourless, generally opaque, cubic crystals,

soluble in less than their weight of cold water.



Symptoms.--Not an active poison, but even small doses sometimes

produce the effects of a common cold, including those symptoms already

mentioned as occurring with iodine.



Analysis.--Iodide of potassium in solution gives a bright yellow

precipitate with lead salts; a bright scarlet with corrosive sublimate;

and a blue colour with sulphuric or nitric acid and starch.





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