Claim: Copper in architecture has ten different copper alloys, one of which has the common term of Red brass.
Evidence: Copper has been used since ancient times as a durable, corrosion resistant, and weatherproof architectural material. It can be a mixture of carbonate and sulfate compounds in various amounts, depending upon environmental conditions such as sulfur-containing acid rain. 
Classification of copper and its alloys Copper alloys, brass Zinc (Zn) Chemical composition of copper alloys Ni [%] Fe [%] Al [%] Other [%] Red brass 833 93 1.5 1.5 4 836 85 5 5 5 838 83 4 6 7 Chemical composition may vary to yield mechanical properties