This section is from the book "A Text-Book Of Materia Medica, Pharmacology And Therapeutics", by George F. Butler. Also available from Amazon: A text-book of materia medica, pharmacology and therapeutics.
Origin. - It is found in the ashes of sea-weeds, and is prepared from the mother liquor obtained in the purification of Chili saltpetre.
Description and Properties. - Heavy, bluish-black, dry and friable, rhombic plates, having a metallic luster, a distinctive odor, and a sharp and acrid taste. It imparts a deep-brown, slowly evanescing stain to the skin, and gradually destroys vegetable colors. Iodine is soluble in about 5000 parts of water and in 10 parts of alcohol, with a brown color; also freely soluble in ether and in a solution of potassium iodide, with a brown color, and in chloroform or carbon disulphide, with a violet color. It should be kept in glass-stoppered bottles, in a cool place.
Dose. - About 1/4 grain (0.016 Gm.) [1/10 grain (0.005 Gm.), U. S. P.], although seldom given in substance.
Liquor Iodi Compositus - Liquoris Iodi Compositi - Compound Solution of Iodine (Lugol's Solution). - Iodine, 5; potassium iodide, 10; distilled water, to make 100 parts. Strength, 5 per cent.
Dose. - 1-10 minims (0.06-0.6 Cc.) [3 minims (0.2 Cc), U. S. P.].
Dose. - 1-5 minims (0.06-0.03 Cc.) [1 1/2 minims (0.1 Cc), U. S. P.].