2-Piper is correct. Aqua Fortis is "strong water" in Latin and it refers to nitric acid, HNO3. The term has nothing to do with being reacted with iron or anything else for that matter. Nitric acid is highly regulated these days because of environmental and safety concerns although you could google it and find a lab supply house that will ship you a small quantity for stockmaking. Be sure to order the "technical grade" as apposed to the "reagent grade". You won't need reagent purity so why pay the premium to get it? Silvers
