When charcoal is applied as a poultice, its ability to draw out toxins from the body depends a great deal on the charcoal maintaining a wet contact with the the skin.Whole flax seed, when boiled in water, produces a wet jelly like material that works well for making a charcoal poultice. Flax seed may also be ground into a meal and mixed with hot water and charcoal powder to produce a charcoal jelly without boiling.
Besides helping to keep the charcoal poultice moist, flax seed also has its own healing benefits.