I used to use hydrochloric, and nitric, acid to etch printing plates.

pretty corrosive stuff.

Make sure you are getting enough zinc and all other minerals back into your system, supllements etc, because acid of that sort just eats them away. literally.

I think I would stay away from this simply because of my experience with it for plates. Nasty stuff. one teeny drop will burn a hole right through your clothes at high concentrations. and the fumes it gives off are noxious and posionous too.