The exact symptoms of a<unk>  depend on the<unk>  involved. Symptoms include itching, bleaching or darkening of skin, burning sensations, trouble breathing, coughing blood and/or tissue necrosis. Common sources of<unk> s include sulfuric acid (H2SO4), hydrochloric acid (HCl), sodium hydroxide (NaOH), lime (CaO), silver nitrate (AgNO3), and hydrogen peroxide (H2O2). Effects depend on the substance; hydrogen peroxide removes a bleached layer of skin, while nitric acid causes a characteristic color change to yellow in the skin, and silver nitrate produces noticeable black stains.<unk> s may occur through direct contact on body surfaces, including skin and eyes, via inhalation, and/or by ingestion. Lipophilic substances that diffuse efficiently in human tissue, e.g., hydrofluoric acid, sulfur mustard, and dimethyl sulfate, may not react immediately, but instead produce the burns and inflammation hours after the contact.<unk>  fabrication, mining, medicine, and related professional fields are examples of occupations where<unk> s may occur. Hydrofluoric acid leaches into the bloodstream, reacts with calcium and magnesium, and the resulting salts can cause cardiac arrest after eating through skin.
Chemical burn
Thermal burn
Electrical burn
Friction burn
Radiation burn
Powder burn
Flash burn
Hydrofluoric acid burn