A green fluid that acts like lava.
If you are melting villagers, you need to have a molten substance in the smeltery(*), otherwise the villagers will not take damage. Liquified Emerald and Liquid Glass will not work.
Notes & Tips
- (*)make sure that this substance is at the top of your smeltery so that it won't get poured out, thereby rendering your setup useless.
- An Auto-Spawner from MineFactory Reloaded, or a villager breeding cell set up to drop villagers into the smeltery is an extremely effective way to mass-produce emeralds