Fizzing dirt and dinosaur discovery

fizzing dirt title

The reaction between baking soda and vinegar is eye-wideningly exciting, and here you can combine it with digging up dinosaurs too. It’s a relatively cheap re-use for toys you probably already have lying around. Here’s how to make it:

You will need:

  • 2 boxes of baking soda
  • Cocoa powder
  • Water
  • Small plastic dinosaurs
  • Large bottle of white vinegar
  • Squeeze bottles
  • Large slotted spoons and tongs
  • Small plastic bin or large plastic bowl
  • Drop sheet
  • Water




1. Empty all the baking soda into a large mixing bowl. Whisk in cocoa powder a tablespoon at a time until the colour looks enough like dirt. Add water a tablespoon at a time until you have a crumbly dough.

2. Pack half the baking soda mixture into the bottom of the bin. Spread out the dinosaurs, and then bury them with the remaining baking soda mixture. Decorate the surface with LEGO trees and rocks if you like. Leave overnight to dry.

3. Put the bin on a drop sheet, as this can get messy though it is easy to clean up. Fill squirt bottles with vinegar and let your child squirt it on the baking soda, which will start fizzing and dissolving. Use the slotted spoons and tongs to fish out the dinosaurs, and the squirt bottles to clean them off. We found adding some water after awhile made a nice, squishy mud to play around with.

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