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Aqua regia

Chemical compound
Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a fuming liquid. Freshly prepared aqua regia is colorless, but it turns yellow, orange or red within seconds from the formation of... Wikipedia
Formula: HNO₃+3 HCl
Boiling point: 226.4°F (108°C)
Melting point: -43.6°F (-42°C)
Density: 1.21 g/cm³
Ratio: ratio 3:1
3D model (JSmol): Interactive image
NFPA 704 (fire diamond): 3 0 0OX