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Prepare equal volumes of a 3% solution of potassium iodide and a 4% solution of lead acetate . The solutions are brought up to boiling and also hot poured together into a flask. When cooled down, lead iodide drops out, which is very soluble in hot water, but very little in cold (less than 0.1% ). The sediment is formed in the form of thin bright in the light scales of golden color. Their dimensions depend on the cooling rate, the slower the cooling the larger the crystals.