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Mercury(II) iodide (HgI2) is a chemical compound with an appearance of red-orange crystals.
M 1685 (OTTO) Mercuric iodide, red, 99% Cas 7774-29-0 - used as an oxidizing agent for the synthesis of quinoxaline. Polycrystalline films of mercury (II) iodide, also play an important role in X-ray imaging.