Lost wax casting in glass is derived from the ancient technique of lost wax casting used for bronzes. A model of the object to be made is fashioned in wax and then encased in a mold made of plaster or another material. The mold is heated, the wax melts (the liquefied wax runs out of the mold through channels), and molten glass is poured into the mold. When the mold has cooled, the mold casing is broken away to reveal the glass object inside. This mold, unlike others made of metal or wood, can be used only once, but finer details may be obtained. Lalique made a limited production of cire perdue glass at his factory.