Origin. - Obtained by dissolving zinc oxide or carbonate in hydriodic acid, or digesting granulated zinc in 10 parts of iodine and 20 parts of water, and evaporating to dryness.

Description and Properties. - A white, granular powder, odorless, and having a sharp, saline, and metallic taste. Very deliquescent, and liable to absorb oxygen from the air and to become brown from liberated iodine. Readily soluble in water, alcohol, or ether. Zinc iodide should be kept in small, glass-stoppered bottles.

Dose. - 1-3 grains (0.06-0.18 Gm.) [1 grain (0.65 Gm.), U. S. P.].