Combine salt, bluing, water and ammonia. Pour over small pieces of rock or coal in a shallow GLASS OR CHINA bowl. Drip food coloring on top, if desired. Crystals will begin to grow soon. Add water occasionally to keep crystals growing. You'll probably want to supervise pretty closely...
Your CRYSTAL GARDEN is ready. Buon appetito!
Related recipes: Children
Season specials: Easter Recipes, Passover Recipes, Christmas Recipes, Season Recipes, Xmas Recipes