This special formula dissolves fouling residue and neutralizes the corrosive acids produced by black powder. Safe in all metals, factory bluing, stainless, nickel, aluminum, polymer frames, rubber and most p plastics. Odorless, non-toxic, non-flammable, biodegradable. Butch's Black Powder Bore Shine was developed specifically for the Black Powder Shooter who asked for a better, faster way to clean their rifles. Butch's Black Powder bore shine comes from a special cleaning solvent used by the U.S. Military. This Black Powder bore cleaner, like the original Bore Shine, does it all. It removes Powder, Lead and Plastic Fouling from your Black Powder rifle faster than any other bore cleaner. Best of all it is odorless, non-toxic, non-flammable, biodegradable and protects against rust and corrosion. You can't find a better cleaner for black powder anywhere. Safe in all metals.