Err... sorry, whats the point of liquid metal?

Its a step along the way for creating metal plates. Pipe it into a Forge to produce plates.

i've built electric furnace and when i open it it gives me list of everything and everything is red with no subcategories.

Electric Furnaces will work ...

i've built electric furnace and when i open it it gives me list of everything and everything is red with no subcategories. i cannot make anything in it. is that normal?