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Acid burns are most commonly caused by sulfuric acid, hydrochloric acid, and nitric acid; in addition, acetic acid (glacial acetic acid), hydrofluoric acid, perchloric acid, and chromic acid are also corrosive poisons. In addition to skin burns, inhaling the volatile gases and mist particles of these acids into the respiratory tract (such as sulfuric acid mist or chromic acid mist) can also cause severe irritation of the upper respiratory tract; in serious cases, chemical bronchitis, pneumonia, and pulmonary edema may occur. What are the first aid measures for acid burns? The wound caused by nitric acid burns forms a yellow scab ； The wound caused by sulfuric acid burns forms a black or brownish-black scab ； Burn wounds caused by hydrochloric acid or carbolic acid form white or gray-yellow scabs. First aid measures: 1. Immediately remove the contaminated work clothes, undergarments, shoes, socks, etc., and rinse the wound thoroughly with plenty of flowing water for at least 15 minutes. In the case of sulfuric acid burns, it is necessary to rinse quickly with large amounts of water; this not only helps to wash away and dilute the sulfuric acid but also eliminates the heat generated by the reaction between sulfuric acid and water. 2. After the initial rinsing, neutralize the acidic substances on the wound surface using 5% baking soda solution (sodium bicarbonate solution), and then rinse with water for 10–20 minutes. Special attention must be paid to thoroughly rinsing the eyes, and rinsing them should be done first, for at least 10 minutes. Injured persons can also submerge their face in water to clean themselves. 3. Debride to remove other contaminants, cover with sterile gauze, and transport to the hospital. 4. For those who have inhaled the substance through the respiratory tract and are experiencing coughing, administer nebulized inhalation of 5% sodium bicarbonate solution or normal saline. 5. Gastric lavage is not advisable for those who have taken the substance orally, especially if it has been some time since ingestion, to prevent gastric perforation. You can start with plain water, followed by consuming about 200 milliliters of milk, protein, or peanut oil orally. Sodium bicarbonate should not be taken orally to avoid the production of carbon dioxide, which increases the risk of gastric perforation. Those who have ingested large amounts of strong acids or who do not receive timely first aid at the scene should be rushed to the hospital for treatment.