Prep. Made by dissolving one ounce of iodide of potassium in eight ounces of distilled water, and making up the solution to ten fluid ounces.

Use. The solution of iodide of potassium is used as a test for the presence of lead, in the oxide, the acetate, and the carbonate of that metal. The oxide (litharge) and the carbonate are dissolved in water, with the aid of a little nitric acid, the acetate in distilled water alone, and the solution of iodide of potassium is added; a bright-yellow precipitate of iodide of lead is produced: it is precipitated at first as a yellow powder, sparingly soluble in cold, but more soluble in hot water, the solution, as it cools, depositing the iodide in beautiful yellow spangles.