Ages 5+

Bubbling Cauldron


Discover spooky science . . . with your very own bubbling cauldron! Design a felt witch and construct a witchy lair — complete with a cauldron connected to a hidden pump. Mix together a witchy brew using citric acid and colored baking soda, use the pump to add water, then watch your cauldron bubble and boil in a creepy chemical reaction!

Why it’s awesome

  1. hand crafted witch

    Chilling creativity

    Use felt and craft supplies to create a spooky scene!

  2. kid watching bubbling cauldron

    Real science

    Experiment with citric acid and baking soda for chemical reactions!

What’s included?

  • peg person

  • roving

  • pipe cleaner

  • sticky foam sheet

  • felt costume set

  • 2 felt sticker sheets

  • 4 brads

  • tray

  • 2 plastic covers

  • backdrop

  • sticker sheet

  • pump

  • cauldron

  • colored baking soda 2.1 oz (62g)

  • citric acid 0.8oz (25g)

  • scoop

  • mess mat

  • stir stick

  • cup

  • illustration instruction booklet

Topics explored

  1. Chemical reactions

  2. Pump mechanics

  3. Special effects

From the desk of the product designer:

Behind the design

In early designs, we were planning on having kids just pour the water into the cauldron to set off their chemical reaction. But that made a real mess during testing! So we came up with the built-in pump system to help direct the flow of water. That way, you can keep things tidy and add a dose of mystery to your spooky display!

- KiwiCo Product Designer

By the numbers


Decorative stickers included in the set


Colors of cauldron bubbles tested


Cackles of joy heard during product testing



29 reviews

Customer images

    Terri M.


    My 11 year old grandson loved this set! He sent me a video of it spilling all over the kitchen sink!



    My daughter enjoyed it. She was able to build it all by herself!



    My daughter really enjoyed being able to decorate her own Spooky scene for the Halloween Bubbling cauldron. Directions were easy to follow. I love how everything is included in the box.



    My granddaughter and 2 friends put this together, they absolutely loved it!

    Cynthia K


    My grandson loved the process of putting it together & the magic cauldron!



    Best crate ever! My 8 yr old loved this.

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