Grow a Crystal Rainbow with Kids

Growing crystals is an interesting Science experiment any time of year, but growing a crystal rainbow seems perfect for St. Patrick’s Day! Here’s how you can grow a crystal rainbow in a few easy steps. 


Crystal Rainbow Supplies


  • 4 cups water
  • ½ cup Borax detergent booster
  • 6 pipe cleaners (colors of the rainbow)
  • scissors
  • jar or glass
  • string
  • craft stick or clothes pin



Make a rainbow from 6 pipe cleaners by twisting the ends of the pipe cleaners on both sides and bending them into a rainbow shape.



Tie a piece of string around one end of the bundle of pipe cleaners. Scoop 1/2 cup Borax into a glass jar. 



Boil 4 cups of water and pour it into the jar (an adult should do this step). Pour it slowly to allow the temperature to adjust so the jar does not crack. Stir until the Borax is dissolved. 



Attach the string to a craft stick or clothes pin by tying a knot. Carefully drop the pipe cleaners into the borax solution so that the they hang in the middle of the jar without touching the edges or bottom. 


Grow a Crystal Rainbow


Crystals will begin forming as the mixture cools. Crystals will form on the pipe cleaners in as little as two hours.

For best results, avoid disturbing the chenille stems for 24 hours.


Crystal Rainbow Science Experiment

Take the pipe cleaners out of the jar and allow them to dry completely. 

Use the thread to hang the chenille stems or cut the string off.

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1 Comment

  • Reply Laura

    This looks so fun! Can’t wait to try this with my kiddos! Thank you for sharing.

    March 5, 2021 at 1:58 pm
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