What concentration of Nitric Acid is safe for treatment of warts?

gee I wouldnt want to put any on my skin! The MSDS for 1M nitric says it is corrosive to skin. I wouldnt want to even try for anything more than 0.01M, I wouldnt try at all! Are you sure you arent thinking of Silver Nitrate for warts? This is commonly used. If you dilute concentrated acid, be sure to remember to add the acid to cold water (not water to the acid, the water will float on the denser acid reacting and getting hot, possibly boiling and spitting!).