Slag

Slag is a type of Stone, a byproduct obtained in the process of making Bars of Wrought Iron.
==How to Acquire==
Load Bars of Cast Iron into a Finery Forge and fuel with two units of Coal. Each bar will have a 50% chance of becoming Bloom, and a 50% chance of becoming Slag.
==Uses== 
*Can be resmelted in an Ore Smelter for a small chance of getting some Bars of Cast Iron back out of it (about 5% or 1 bar/smelt).
*Used along with eggs to produce Turquoise Pigment for Sketches.
*Can be used in paving.
==Trivia==
Slag is completely useless waste product in legacy.