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These three very corrosive chemicals are closely related. Oleum is cloudy, oily, fuming liquid or sometimes a solid which releases sulfur trioxide in contact with air as in a spill. This sulfur trioxide reacts quickly with any air moisture producing a fine sulfuric acid mist. Inhalation at low concentrations for a short period irritates the nose, throat, and lungs. Prolonged exposure or higher concentrations causes a burning sensation, coughing, gagging, chest pain, fluid in lungs, and possib