Concentrated nitric acid (69 to 71%) is a transparent, colorless or yellowish fuming, suffocating, hygroscopic, corrosive liquid. Attacks almost all metals. Miscible with water and decomposes in alcohol. Dangerous fire risk in contact with organic materials. Highly toxic by inhalation, corrosive to skin and mucous membranes, strong oxidizer.
Nitric acid is commonly used to dissolve gold from printed circuits boards by making aqua regia, typically 1 part Nitric acid to 3 parts Hydrochloric acid.
Specific Gravity: 1.4