Homemade willow charcoal

This is my second attempt at making willow charcoal, next time I will need to use thicker pieces of wool, cut pieces of willow so they would fit in to old metal sweety tin, take bark of them, fill the tin up to the top put 5 holes in the lid and put on top of outside camp fire or barbeque coals that are grey ash colour, leave until fire goes out and tin has cooled down, then you will have hopefully some charcoal, be carefull with fire (dangerous) and make sure you make holes in lid so steam and gas can escape.