Gunmetal

Gun metal, also known as red brass in the United States, is a type of bronze – an alloy of copper, tin, and zinc.

Originally used chiefly for making guns, it has largely been replaced by steel for that purpose.

[1] It is used to make steam and hydraulic castings, valves, gears, statues, and various small objects, such as buttons.

Gun money, Irish late 17th-century emergency coins, contain gunmetal, as worn and scrapped guns were used to make them; but also many other metals, in particular brass and bronze, as people donated pots and pans and other metal objects.

External doors and windows of offshore rock lighthouses are often made of gunmetal due to its corrosion resistant properties.