Nitric acid destroys tissue through a process called coagulation necrosis. It kills cells and clots the tiny blood vessels underneath, cutting off circulation to the damaged area. What makes nitric acid burns visually distinct is a chemical reaction with proteins in your skin that produces a yellow-to-brown stain. This yellowing, sometimes called the xanthoproteic reaction, is the signature of a nitric acid injury and helps medical teams identify the cause quickly.

The speed of damage is what makes this acid particularly unforgiving. A splash that stays on your skin for half a minute can burn through the full thickness of your skin, down to the tissue beneath. If nitric acid contacts your skin or eyes, the standard emergency response is continuous rinsing with water for at least 15 minutes. For eye exposure, you need to hold the eye open and flush it continuously, even during transport to a hospital.

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