The 'lost wax' process is a method that requires the metallurgist to build a wax replica of the item that is desired to be replicated, followed by the coating of the wax sculpted article in a heat resistant yet durable exterior, typically a ceramic, which is then fired to permit the wax to run out through a pipe known as the sprue prior the the pouring of the molten alloy into the channels at the mouth of the mould. The most typical use of this method of metalworking is detailed sculpture in bronze.