Wont try and answer for M.P. , but when I lived in AK (pre 9-11) I used to make my own Aqua regia. I would use Reagent Grade Nitric and Hydrochloric acids, with some steel wool dissolved in it. Works quite well.

There was a chemical supply house in Anchorage that carried it in small batches. Back then, finding chemicals seemed easier in AK than in the lower 48, many of these chemical supply houses support/supply the gold mining industry.


V/R

Mike

Mike Hunter
www.mikehunterrestorations.com