Description The Birchwood Casey Brass Black Touch-up 32oz is a fast-acting liquid designed specifically for gunsmithing and industrial applications. This versatile product effectively blackens or antiques brass, copper, and bronze parts without causing any dimensional change. Ideal for marking cartridge cases to identify loads, it also excels in enhancing name plates, plaques, castings, sculptures, and various home workshop projects. The final appearance can be customized based on the alloy used, and applying a clear coat finish, wax, or oil can enhance the result. Perfect for both professional gunsmiths and hobbyists looking for reliable touch-up solutions.