Toxic Gases & Vapors
Aqua regia; [ChemIDplus] Nitromuriatic acid; Chloronitrous acid; Chloroazotic acid; [Merck Index] Met-Etch; [CAMEO] UN1798
Yellow fuming liquid with a suffocating odor; [Merck Index] Red, yellow, or gold fuming liquid; [University of Oxford MSDS]
"Mixture of hydrochloric & nitric acids." [ChemIDplus]
Contains nitrosyl chloride and free chlorine; Corrosive; [Merck Index] A strong oxidizing agent with known catalytic activity; Reacts with air; Causes burns; [CAMEO] Causes burns and severe respiratory tract irritation; Highly toxic by ingestion and inhalation; [University of Oxford MSDS] See "Nitric acid" and "Hydrogen chloride."
Occupational diseases associated with exposure to this agent: