Blurite bar

A Blurite bar is a bar of refined blurite. It can be created through the Smithing skill at level 8, if a player has completed The Knight's Sword quest. It can be made by using a blurite ore on a furnace, granting 8 Smithing experience. A blurite bar can be smithed, by members, on an anvil through the Smithing skill to create unfinished blurite bolts for use in the creation of blurite bolts or blurite crossbow limbs for use in a blurite crossbow. In the knights sword free players can smith it.

Trivia

 * Free players could have made blurite bars ("Member's Item" after smelting blurite ore) when blurite smithing was introduced. All they had to do was instead of choosing to smelt it, they use the ore on the funace instead. It was later fixed.
 * Oddly you need 8 smithing and completion of The Knight's Sword quest to smelt this bar. But the quest gives more than 12k exp (if you where level 1 in smithing you'd be 29) completely passing the level 8 requirement.