make a magic rock crystal garden
Nice project to do together
Details
Crystal Garden Recipe: Printer Friendly version from Just Kids Recipes
 
Crystal Garden
6 tb Salt
6 tb Bluing -- liquid
6 tb Water
1 tb Ammonia
Food coloring
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...