Dictionary
Bronze

Bronze is a non-magnetic because non-ferrous alloy compounded of 80-90 % copper and approx 15 % tin. The density of bronze is 8.7 g/cm³; its melting point is just below 1000° C. The word "bronze" derives from Brundisium, the Latin name of the southern Italian city of Brindisi, which in antiquity was a centre of bronze casting and the bronze trade in antiquity. In art bronze is used for casting sculpture and making crafts objects. A model is needed before a work is cast in bronze; there are two main processes for casting bronze: the lost-wax process, investment casting, in which the mould is destroyed (a wax model over a clay core; French "à cire perdue") and sand-casting, used for hollow objects, for which a sand is packed round a plaster cast of the original sculpture to make a negative mould. The plaster mould is removed and molten bronze is poured into the space between the core and the oven-dried sand mould.