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Lead iodide is a salt with the formula PbI2. At room temperature, it is a bright yellow heavy odorless powder, that becomes orange and red when heated. It is typically used in photography, medicine, printing, mosaic gold, and bronzing. The compound also has a few specialized applications, such as the manufacture of solar cells, x-ray and gamma-ray detectors. Its used as a precursor material in the fabrication of highly efficient solar cells. Its used as a high-energy photon detector for gamma-rays and x-rays, due to its wide band gap which ensures low noise operation.