IProposeWe make "fireworks" in a glass! :3

How to create underwater "fireworks".

Materials You Will Need:

• Water
• Oil
• Food Coloring
• Tall Clear Glass
• Another cup or glass
• A Fork

Procedures:

1. Fill the top of the tall clear glass almost full with warm water or water at room temperature.
2. Poor about 1-2 tsp of oil into the other cup or glass.
3. Add a couple of drops of food coloring into the cup or glass of oil.
4. Stir to mix the food coloring and the oil with the fork. Stop after breaking up the food coloring drops into smaller drops. You don't want thoroughly mix the liquid.
5. Pour the oil and food coloring into the tall clear glass.
6. Watch how the food coloring slowly sinks into the glass, with each droplet expanding as it falls, resembling fireworks.

Scientific Principles:

1. Food coloring does not dissolve in oil, it only dissolves in water.
2. When you stir the food coloring in the oil, you break up the coloring droplets.
3. Since water is more dense than oil, the oil floats on top of the glass.
   
4. In step 6, the color diffuses outward as the heavier colored droplets fall to the bottom.
   

Safety Precautions:

• Wash your hands before and after experiment
• Be careful not to get food coloring on your clothes but if you do, use diluted bleach in warm water
  

For more information, go to:
http://chemistry.about.com/od/4thofjulychemistry/a/waterfireworks.htm