Claim: Copper in architecture has ten different copper alloys, one of which has the common term of Red brass (88% copper, 8–10% tin, and 2–4% zinc).
Evidence: Copper has earned a respected place in the related fields of architecture, building construction, and interior design. From cathedrals to castles and from homes to offices, copper is used for a variety of architectural elements, including roofs, flashings, gutters, downspouts, domes, spires, vaults, wall cladding, and building expansion joints. Red brass C23000 85% copper; 15% zinc Gun metal, also known as red brass in the United States, is a type of bronze – an alloy of copper, tin, and zinc. Proportions vary but 88% copper, 8–10% tin, and 2–4% zinc is an approximation.