One comment, without trying to go beyond my technical knowledge, but Aqua is water, Aqua Fortis is essentially "Strong Water". This was the old term used for Nitric acid & had nothing to do with having dissolved the iron in it. It was Aqua Fortis prior to the iron being being dissolved. Aqua Regia was "Royal Water" & was a mixture of Nitric & Hydrochloric acids & was so called because it would dissolve the "Royal Metals" IE Gold & Platinum. These words I believe are Latin derivitives.
Miller

Miller/TN
I Didn't Say Everything I Said, Yogi Berra