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Note that the test results do not distinguish between residues from <br /> gas manufacturing and other sources. For example, lead is commonly found in <br /> the environment, particularly in high-traffic urban areas, as a result of <br /> automobile emissions. Cyanide is a common ingredient in certain pesticides, <br /> rat poisons, silver and metal polishes, photographic solutions, and fumigating <br /> products. Arsenic is widely used in insecticides and other pesticides, paint <br /> pigments , and as a hardening agent in metals. <br />