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A collection of methods for the manufacture of technology secrets for all occasions


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Equal volumes of a 3% solution of potassium iodide are prepared as well as a 4% solution of lead acetate . The solutions are brought to a boil and are also hot poured together into a flask. When cooling in sludge, lead iodide falls out, which is very soluble in hot water, but very little in cold (less than 0.1% ). The precipitate is formed in the form of thin golden scales, bright in the light. Their sizes depend on the cooling rate, the slower the cools the larger the crystals.