AQUA REGIA

AQUA REGIA

This acid is a mixture of nitric and hydro-chloric acids in the proportion of one volume of nitric and from one to three parts of hydro-chloric acids, the strongest and best results being obtained when the propor¬tions are about one of nitric and two of hydro¬chloric acids. It should not be prepared until required for immediate use, as it deteriorates rapidly.