Fill your jar half way with oil.
Add an almost equal amount of water, but you don't want to fill the jar to the top or a huge mess will occur. Watch the water settle to the bottom of the jar.
Add 4-6 drops of food coloring. Watch the color float to the bottom of the oil, then break through the oil and sink to the bottom of the jar through the water.
Now for the coolest part, the part that puts the fizz (carbon dioxide) into the fun, drop an effervescent tablet into the jar and watch the carbon dioxide do some magical things..........
Originally, I wanted to show you photos of the red jar to represent the Carbon Star, but the blue photos turned out so cool! Oh, and by the way, this is also a great color mixing experiment! Check out more fun PTOE activites by having a look at the sidebar.