4 tbsp. salt
4 tbsp. water
1 tbsp. ammonia
Charcoal
Colored inks (optional)

Mix salt, water and ammonia. Pour solution over small pieces of charcoal that have been placed in a small bowl. Drop desired color of ink drops on charcoal. Place bowl in an undisturbed place for several days. Crystals will grow more everyday. Without colored ink, crystals will be white.

This experiment will fascinate kids.