Dinosaur Bath Eggs

Dinosaur Bath Eggs

I’ve been cheeky this week!  We’ve had so much dinosaur-based fun, that I’ve written an extra blog post so I can give you detailed information so you can have a go yourselves.  Trust me, it’s worth it – these are fantastic!


To make one dinosaur bath egg, you will need:

½ cup bicarbonate of soda

10 drops liquid watercolour

2 tablespoons citric acid (in granular form)

3-4 teaspoons vegetable oil

A small, plastic dinosaur

Baking paper


In a dry bowl, drop the liquid watercolour into the bicarbonate of soda. Next rub it with your fingers until the colour is mixed through.  Add the citric acid and stir.  Add the oil and rub it all together.  You should have a powdery substance that will hold together in a lump if you squeeze it hard!

In a cupped hand, put some of the powder and press it down.  Put the dinosaur on top, then keep adding the powder in small amounts and pressing hard. You need to do this until you have totally covered the dinosaur.  You will  have an egg-like shape.  Place very carefully onto a tray lined with baking paper, and leave to harden overnight.

We made several eggs in different colours, mixing the leftovers together to make multi-coloured eggs (which I think were my favourite!).  Miss N was able to make these with supervision. There were lots of problem solving skills used to find out the best amount of oil and how to handle the egg without it falling apart!

Now the fun really begins! 

We turned our bath into a dinosaur swamp, by adding a few drops of green liquid watercolour and some cut grass.  Both children loved watching the eggs fizz as they went into the water, and the force of the fizz made the water rise a fair bit.  We scooped up all of the grass at the end of the bath and made a nest in the corner for our newly hatched dinosaurs.

The older your children, the more detail you can go into about the chemical reaction taking place between the alkaline bicarbonate of soda, and the acidic citric acid.  It would be interesting to think about why adding the oil as a liquid when making the eggs doesn’t trigger a chemical reaction, but adding water does!

A note of caution: the oil does make the children and the bath a little slippery!  If you want a little less mess, then the children would have just as much fun putting the eggs into a deep bowl of water and watching them fizz away in there.


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