DIY Fizzy Dinosaur Eggs

Here's your nightly math! Just 5 quick minutes of number fun for kids and parents at home. Read a cool fun fact, followed by math riddles at different levels so everyone can jump in. Your kids will love you for it.

DIY Fizzy Dinosaur Eggs

August 18, 2014

Splash, fizz, and bubble all in the name of dinosaur fun. Kids of all ages adore playing with dinosaurs. Now you can hatch your own dinosaurs at home! Granted, they’re plastic dinos, but they’re safer to play with than the real thing.

What are fizzy dinosaur eggs?

In this instance, they’re adapted from a combination of recipes for “bath bombs” I found online. After trying several variations, I’m sharing our favorite combination.

Let’s gather our ingredients and get started!

  • Baking soda
  • Citric acid powder (found in the canning section of stores)
  • Spray bottle with water
  • Vegetable oil
  • Food coloring
  • Glass or plastic mixing bowl (avoid metal because of a chemical reaction)
  • Small dinosaurs to place inside


To make one fist-sized dino egg, you will need:

  • ½ cup of baking soda
  • 1 tablespoon of citric acid
  • 1 teaspoon of oil
  • 1-2 drops of food coloring


Your kids can measure these items into the bowl and get their hands dirty mixing them up. Although the material may not look colorful now, it will not disappoint later.

Next add in the oil and mix. The mixture will be crumbly. You will need to add a small amount of water to moisten it enough to create a dough-like consistency in order to form an egg. Humidity and weather will play a factor in how much water is needed, so I can’t tell you an exact quantity here. However, I do know that you have to add the water gently, a small amount at a time with the spray bottle to avoid (or at least minimize) any reaction from the mixture.

When you are able to squish the dough in your hand and it barely crumbles, you are ready to hide a dinosaur inside.

DIY Fizzy Dinosaur Eggs

Making one dinosaur egg is fun, so creating ten eggs will be ten times as fun, right? Try it and see. Work with your little ones to double, triple, or otherwise multiply the recipe and create a full nest of eggs.

Let the dinosaur eggs dry overnight and put your kids to bed with this dinosaur-themed Bedtime Math problem.

The next day, drop your eggs into a bowl of water, a small swimming pool, or bathtub and watch them dissolve in fizzy bursts. Which dino hatched first?

DIY Fizzy Dinosaur Eggs

Older children may want to further the fun and see how the amount of citric acid added to each egg changes the volcano-like reaction of the egg in water. Mix up a several new batches. First use the basic recipe, then mix up another with twice the amount of citric acid, two tablespoons, per egg and finally, mix up a batch with three times as much citric acid per egg. Color code the batches to keep them straight. Note how their reactions vary when placed in water.

No dinosaurs?

Don’t worry if your kiddos don’t have any dinos to excavate from the bottom of their toy bin. You can use all sorts of tiny treasures, like coins, inside the eggs. Coins have the added advantage of bringing in extra math to the project. Who doesn’t want to count that type of hidden treasure?

Photos courtesy of Beth Levine

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About the Author

Beth Levine

Beth is a mom of two young boys in the Capital Region area of New York. She blogs at and can be found on Twitter via @TheAngelForever. Beth is a lifelong learner and educator that is always looking for new and fun ways to get kids thinking.

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