Toxicity Concentrated nitric acid and its vapors are highly corrosive to the eyes, skin, and mucous membranes.
Dilute solutions cause mild skin irritation and hardening of the epidermis.
Contact with concentrated nitric acid stains the skin yellow and produces deep painful burns. Eye contact can cause severe burns and permanent damage. Inhalation of high concentrations can lead to severe respiratory irritation and delayed effects, including pulmonary edema, which may be fatal. Ingestion of nitric acid may result in burning and corrosion of the mouth, throat, and stomach. An oral dose of 10 mL can be fatal in humans.