Once the wax is gone, the chalk coat has inside cavities which replicate in negative the exact shape of the wax models. At this point, the cylinder goes directly in the second furnace where the proper casting takes place: the furnace for exhausted microcasting. In this stage, the alloy of melted metals, silver and copper in the right proportions, is poured in the matrix, filling the hollow spaces inside the chalk coat. It is very important that the necessary quantity of metals is carefully calculated in order to obviate losses or wastes of raw materials. « »