Lead oxide (litharge)
You can smelt lead or galena to litharge to do crystal glass instead rock crystal.
Earlier it was lead oxide, but someone told me, that English has better word for it.
Current video became old, but it still enough to understand this mod, I’m to lazy to change it.
Now:
1 lead bar —> 4 litharges crystalls
1 galena ore —> 16 litharges crystalls
