The Smelting urn (r) is created by using a fire rune on a Smelting urn (nr). It can be used to collect scraps while smelting bars that require level 50 Smithing or lower. Once it starts to get filled, it becomes a Smelting urn. The Artisan's workshop bars(ingots) will not work. It will not be able to become a Smelting urn if the player owns 10 completely filled Smelting urns or has another partly filled Smelting urn in the bank or inventory.