finishes have a neutral grey background with bluish or purplish tinges, sometimes referred to as "black chrome." Its name derives from a particular alloy of copper, bronze and zinc, which was originally used in gunmaking, though many alloys currently use the gunmetal designation as it is currently based on appearance. The original alloy (also known as "red brass," patinaed over time to a near-black shade of grey. Gunmetal alloy is resistant to corrosion from steam and salt water. There are many alloys called "gunmetal."