Birchwood Casey ALUMINUM BLACK TOUCH-UP 3 OUNCE Touch-Up Metal BC-15125 The room temperature chemical used by gunsmiths and industry to blacken aluminum parts. Restores scratched and marred areas quickly. Fast-acting liquid is easy to apply with no dimensional change. Color will vary from deep gray to black depending on alloy. Aluminum black metal finish is also excellent for blackening name plates plaques trophies and other engraved items. Final appearance can be enhanced by applying a clear coat finish wax or oil. The BW Casey Aluminum Black Touch Up 3 oz. is the room temperature chemical used by gunsmiths and industry to blacken aluminum parts. It restores scratched & marred areas quickly. It is also excellent for blackening name plates plaques trophies and other engraved items.