The Birchwood Casey Brass Black Touch-Up – 32oz is a fast-acting liquid designed for gunsmiths and hobbyists to blacken or antique brass, copper, and bronze parts. Easy to apply without causing any dimensional changes, this versatile product is perfect for marking cartridge cases to identify loads. It can also be used on name plates, plaques, castings, and sculptures in your workshop. Achieve a stunning final appearance by applying a clear coat finish wax or oil. Experience professional results with this essential touch-up solution.