1) Break brick or charcoal into small pieces and place in a bowl or pan or jar.
2) Mix 25ml. salt, 25ml of liquid bluing, 25ml. of water and 1 teaspoon of ammonia together.
3) Pour the solution over the pieces of coal or brick. Put several drops of different colored food coloring on the charcoal. Let sit for several days without moving the dish. Crystals should being growing in 7 or 8 hours.
4) Crystals are formed because water is absorbed by the charcoal, leaving everything else to from crystals.