I can't find willow wood nor can I saw a tree that has an owner, so I thought as a possible substitute to food grade charcoal. It comes in a very fine powder and it's used as a colorant, for example, for making real black bread. The specifications say "The E153 additive is active charcoal, which is obtained from the carbonization of vegetable substances such as wood, cellulose residues, peat and coco shells or other shells". Do you think we can use it with some success? Thanks