Charcoal 4 : Residue from the destructive distillation of wood or animal matter with exclusion of air; contains carbon and inorganic matter. Activated charcoal used as an absorbent, e. g. in masks to counter toxic gases. (Chambers)
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}