High exposure may cause liver, kidney and lung damage, including lung allergy. It is used in manufacturing plastics and other chemicals, such as adhesive resins in particleboard, plywood, foam insulation, and other products. Acute exposure irritates and burns the skin, eyes, nose, mouth, and throat. Chronic exposure may cause both an asthma-like allergy and bronchitis with symptoms of coughing and shortness of breath. Formaldehyde causes cancer of the nasal passages in animals and is considered a probable human carcinogen.
Hydrochloric acid is a corrosive colorless to slightly yellow gas with a strong odor.
It is used in metal processing, analytical chemistry, and in making other chemicals. Acute exposure to hydrochloric acid can cause severe burns of the skin and eyes, leading to permanent damage and blindness. Chronic exposure damages the lungs and may erode the teeth. Hydrocyanic acid is a flammable and reactive pale blue liquid or gas with a bitter, almond-like odor. The gas is used in industry to kill rodents and insects.