94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

90% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

mild steel

german silver

lead

graphite.

stainless steel

gun metal

german silver

duralumin

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

10% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

lead base alloy

tin base alloy

copper base alloy

(a) and (c) above.