- Vegetable Oil
- Gel food coloring
- Original Alka-Seltzer tablets
To begin, color about 1/2 cup of water with food coloring. Take the Alka-Seltzer tablets and break them into 2 or 3 pieces. Place them in a small cup or container. Fill a glass about 3/4 full with vegetable oil. Then pour in the colored water until the liquid in the cup is about 1-2 inches from the top. The water and oil do not mix and the oil doesn’t change color because the food coloring is water soluble. The Alka-Seltzer reacts with the water to make bubbles of carbon dioxide. The bubbles attach themselves to the blobs of colored water and bring them to the top of the glass. When the bubbles pop, the blobs of colored waterfall back to the bottom of the glass.
Courtesy of hellogiggles.com