Heck, I mix concentrated HCL and HNO3 with 30% H2O2 every day to dissolve animal feed samples for mineral and metal analysis. Heat it up to 125 deg. C and cook it. It isn't that bad if you have a fume hood. H202 mixed with HCL can be nasty stuff without one.Now Hydrofluoric Acid is what makes me nervous! I triple glove with that stuff.