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Mercaptan, also known as methanethiol is a foul-smelling gas that is added to natural gas. Since natural gas is colourless and odourless, mercaptan acts as an odorant to make it easier to detect.[2] It is added as a safety measure to ensure that natural gas leaks do not go undetected. It is an organic gas composed of carbon, hydrogen, and sulfur. Mercaptan is found naturally in living organisms, including the human body where it is a waste product of metabolism.