Muratic acid is nothing but the old timey name for hydrochloric acid. Mix it with potassium nitrate at the rate of one cup per gallon of muratic acid and you get aqua regia, a mixture of hydrochloric and nitric acids, which Jim Hrisoulas likes for putting a brown patina on steel and an acid finish on wood. Straight white vineagar is a lot easier to come by and safer to use. The big problem with making aqua regia from muratic acid is trying to find potassium nitrate. I guess that Home Land Security is afraid of people making gun powder in their basments and it has dissappeared from pharmacy shelves and I have yet to find a web site that will sell it to private individuals.
Doug Lester