Copper used in structures, normally for roofing, oxidizes to variety a green patina of compounds called verdigris. Copper just earlier mentioned its melting level retains its pink luster shade when plenty of gentle outshines the orange incandescence coloration. Copper, silver, and gold are in group 11 in the periodic table; https://socialevity.com/story19934836/an-unbiased-view-of-copper-wire