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Liquid glass is a by-product of the Thermionic Fabricator that is created by Sand/Glass once place in the Thermionic Fabricator it produces liquid glass. The liquid glass is then moved to the slot below and consumed in certain Thermonic Fabricator recipes.
Liquid Glass is required to create all of the Electron Tubes which are a requirement for further recipes from the Forestry Mod.
The only way to get it out of the thermionic fabricator is to use a pipette to put it in a squeezer where it can be piped out.