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Sulfur Dioxide ToxicitySulfur is an impurity in many common raw stoneware and earthenware clays (although in very small percentages). During firing it forms a pungent gas that can detected in even small amounts. Sulfur dioxide is a common outdoor pollutant, it is a by-product of the burning of carbon fuels. Exposure can irritate the eyes, nose and lungs because it forms an acid when combined with moisture. Over exposure can have serious effects on the respiratory tract and ability to breathe, a doctor should be consulted. Out Bound Links
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