Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–

1:

cone, HNO_{3} and cone. HCl

2:

conc. HNO_{3} and conc. H_{2}SO_{4}

3:

dil. HCl and dil. HNO_{3}

4:

cone, HCl and cone, HNO_{3}

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