Quote Originally Posted by OzJohn View Post
Didn't old time chemists call a mixture of nitric and hydrofluoric acids Aqua Regis because it reputedly was the only thing that could dissolve the noble metals? Not being a chemist I'm unsure what glacial acetic acid contributes to the power of this combination but I can certainly vouch for its corrosive powers on skin. I was not aware that it is flammable - you live and learn. OzJohn
I think what you refer to is a mixture of nitric acid and hydrochloric acid or just sodium chloride ( normal cooking salt ) added to nitric acid. As long as you get the chloride ions into the nitric acid it works.