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Mix up a batch of crazy colors and scare your peeps {Halloween Science}

October 24, 2016 1 min read

Part color-change, part stink-up-the-kitchen – this Halloween science activity requires a bit of preparation, but it is totally worth it!

Plus in the process, you can teach your kids about acids and bases.

Let's dig in...

Crazy Colors {A Halloween Science Activity}

Amaze your students with this coloring changing Halloween science activity!

Materials Needed

  • A head of red cabbage
  • Knife
  • Pot
  • Water
  • Strainer
  • Clear glass or plastic container
  • Ammonia

Steps to Complete

  1. Chop up a third of the red cabbage head. Place it in the pot and cover it with water. Bring the water to a boil and let it boil for 10 to 15 minutes – basically until the water is a deep purple color.
  2. Let cool the red cabbage juice before straining about a cup of the liquid into the clear glass or plastic container.
  3. In front of the peeps, you want to fool, add a tablespoon or so of ammonia. (You should see the liquid go from deep purple to bright neon green! If you don’t, add more ammonia.)
  4. If you want to add a bit more, you can always add some white vinegar to change things back to purple and then pink, which is really fun too!

Results & Explanation

Red cabbage juice acts as an indicator of pH, which is a fancy way of saying that it changes color – in the presence of an acid, it can turn pink and in the presence of a base, it can turn bright green. Ammonia is a base, vinegar is an acid.

Additional Resources

Need a few more ideas for adding some science to your Halloween festivities? Check out our fall science board!


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