sick pumpkin (elephant toothpaste)

Sick Pumpkin, Elephants Toothpaste, Halloween Science Activity

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Time: 10 mins

Skill level: Medium


  • A clean plastic soda bottle or a water bottle. 
  • 20-Volume hydrogen peroxide liquid (For best results, but at a beauty supply store.) 
  • 1 Tablespoon of dry yeast 
  • 3+ Tablespoons of warm water 
  • Liquid dish washing soap 
  • Food coloring 
  • Small cup


  1. Use a funnel to carefully pour 1/2 cup of the hydrogen peroxide liquid into the bottle.
  2. Add about 10 drops of your favorite food coloring in to the bottle.
  3. Add about 1tablespoon of liquid dish soap into the bottle and swish the bottle around a bit to mix it.
  4. In a separate small cup, combine the warm water and the yeast together and mix 
for about 30 seconds.
  5. Use the funnel to pour the yeast-water mixture into the bottle and watch! 

grandpa’s thoughts:

You just gotta try this with your grandkids! It’s fun to talk science with your grandkids.



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