Ages 5+
Ages 5+

Bubbling Cauldron


What you get

Discover spooky science — with your very own bubbling cauldron. Design a felt witch and construct the witch’s 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!

As seen on: KTLA




From the desk of the product designer:

Behind the design

Double, double toil and trouble! This crate is a super fun fusion of Halloween and chemistry!

By the numbers

Decorative stickers included in the set: 23

Colors of cauldron bubbles tested: 5

Cackles of joy heard during product testing: 83+



4 reviews

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Oct 18 2021

This was a great project. My 7 year old and 10 year old did it together and split up the tasks. It worked well. Although they have done experiments with baking soda and citric acid before, the Halloween theming with the witch and cauldron and spooky laboratory to decorate, as well as operating the pump, added a lot of interest. I loved how the guide book included information about other pumps in real life, such as the human heart. After the kids had their fill of pumping the bubbling and fizzing cauldron, we were able to pour the water out of the tray and put it away for future use. It won’t hold up forever, but should work for several uses. An excellent Halloween project or gift.

Oct 15 2021

Our 5 year old LOVED this activity and wanted to share her project with everyone. I like that it can be used over and over too. I highly recommend this product for a reasonable price.

Oct 13 2021

The kids (ages 6 and 3 loved it!) They used it all in one sitting. Then the older one found citric acid in another kiwi crate and to make more!