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Slag is a secondary output of the Thermal Expansion Induction Smelter. The slag can be cooked in a furnace to make Rockwool which is non-flammable wool. Slag can be used to make a florb. Florbs are a item that can be used to make a holdable liquids, not using a bucket. The liquids vary from hot Lava , to Gelid Cryotheum. 

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