When making charcoal for black powder how do you know when its done. I make two batches and they looked good. Made a third batch and after it cooled it still had a little that wasn't done all the way. it seemed to have stopped smoking so i figured it was done. Another thing is what do you look for when you may have over cooked the charcoal? I think that doing this correctly really improves the quality of the powder. Im using cedar shavings.