What you'll need
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How to make it
These tablets are medicine with aspirin in them, so a grown-up keeps the pack and hands out 1 piece at a time.
1Add water
Fill the bottle about 1/4 full with water.
2Add oil
Pour in oil until the bottle is almost full. Wait for it to settle on top.
3Drip in color
Add 5 or 6 drops of food coloring. Watch them sink through the oil and burst into the water.
4Start the lava
Grown-up step: break a tablet into 4 pieces and hand your kid 1 piece at a time. Drop it in.
5Watch the blobs
Colored blobs rise to the top, pop, and sink back down. Shine a flashlight from below.
6Talk about why
Oil and water don't mix, and oil is lighter. The tablet makes gas bubbles that carry colored water up. At the top the gas escapes, and the water sinks.
Edie's tipCap the bottle after the bubbles stop. Add a new piece any time to restart it.
Written by the DIY Project team. How we check · Report a mistake
