The cracked smelting urn (full) is an item made by filling a cracked smelting urn while smelting or superheating bars. It can be teleported to Ernie by clicking it, giving 40 Smithing experience. Players can have up to ten full urns of any type at any one time. Once that number is reached, new urns will not start collecting charges. A full urn can also be given to Ernie manually by using the item on him, or through a chat option while having a full urn in the inventory. Full urn can also be teleported automatically by toggling the auto teleport current skilling urn when full option on under Inventory options in General gameplay settings.
Players can also use an urn enhancer unlocked at level 24 Invention to get 25% more experience.