Other names: Aqua fortis, Spirit of niter, Eau forteHydrogen nitrate, Acidum nitricum, Nitric acid (> 70% in water), Fuming nitric acid, Engravers acid, HONO2, Red fuming nitric acid, RFNA, White fuming nitric acid (WFNA)
Appearance: Colorless, yellow or red fuming liquid ; Colourless-to-yellow liquid with pungent odour ; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]
Appearance: Colorless solution ; Colourless gas or colourless liquid (below 19.5 °C) ; Colourless gas or colourless fuming liquid with pungent odour ; Colourless fuming liquid with pungent odour ; Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.]