Aqua Regia
A mixture of nitric and hydrochloric acids, usually 1:3 or 1:4 parts HNO3 to HCl, used to dissolve gold. Also known as "Royal Water".
It is a highly corrosive liquid that will attack many substances unaffected by others.
See also: Gold, Hydrochloric Acid, Nitric Acid.
Subjects: Chemistry