Inhalation: Inhalation can cause severe irritation of mucous membranes and upper respiratory tract. Symptoms may include burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting. High concentrations may cause lung damage. Higher exposures can cause a build-up of fluid in the lungs (pulmonary edema), a medical emergency. Ingestion: May cause abdominal pain, nausea, vomiting, colic and diarrhea, circulatory disturbances, central nervous system depression, irritability, restlessness, convulsions, cyanosis, respiratory and cardiovascular collapse, and death. Estimated lethal dose 30 grams. Skin Contact: Can irritate the skin causing a rash or burning feeling on contact. High concentrations could cause burns. Eye Contact: Causes irritation, redness, and pain. May cause burns and possible damage to vision. Chronic Exposure: Exposure may induce allergic reaction. Aggravation of Pre-existing Conditions: Persons allergic to "sulfiting" agents, used to preserve some foods, may be more susceptible to the effects of this substance.