Most jewelry and Gold or Silver sculptures use a traditional method of manufacture called Lost Wax casting. Lost-wax casting sometimes called by the French name of cire perdue (from the Latin cera perduta) is the process by which Gold or Silver is cast from an artist's sculpture. A wax form is obtained and the wax is fused onto a rubber base, called a "sprue base". Investment (refractory plaster) is mixed and poured into the flask, filling it. Casting is usually done straight from the kiln either by centrifugal casting or vacuum casting.