Originally posted by PakaNoHida:

Originally posted by Anno:

it's 1 ore to 1 bar

Actually it is not. You can put 10 ore in and 20 charcoal and still only get 9 bars, thus requiring more firing time.

Thus Viking science

This isn't true. For every ore you put in you get a bar out. The charcoal ratio is off though, so maybe that's what you are thinking of.