Homemade Dinosaur Bath Bombs – A New Hatching Dino Eggs

If you have spent any time on STEAM Powered Family you have probably seen one of our most popular activities of all time Hatching Dino Eggs. It’s a chemistry experiment for young scientists that kids (and adults) love. Some of my favourite messages are from teachers and educators who did this activity with a large group of smiling excited kids. Those pictures are the best! That popular activity was the inspiration for our newest bath bomb recipe: Dinosaur Egg Bath Bombs!

Dinosaur Bath Bombs – A New Twist on Hatching Dino Eggs

Dinosaur bath bombs made with love for young paleontologists

Disclaimer: This post contains affiliate links

Of all the many different things kids love, I think dinosaurs is one of those universal things. I have yet to meet a child that was not fascinated, and insanely knowledgeable, about dinosaurs. I think that is why the early chemistry lesson of Hatching Dino Eggs is so popular.

Recently we have become obsessed with making bath bombs. As the kids have gotten older, they need more sophisticated and complex chemistry lessons. They still love the hands on approach, which is why bath bombs have become such a hit as part of our science studies.

This week we decided to take one of our popular activities and bring it together with our new passion. The result Dinosaur Bath Bombs. These bath bombs “hatch” in the bath revealing a surprise inside… your very own dinosaur!

Dinosaur egg bath bombs for kids

Dinosaur Bath Bombs Science Lesson

Now you can definitely make these for your young paleontologist and they will absolutely LOVE them. No question. But for older kids, why not involve them in making these? They can be gifted to someone they care about, or kept for their own enjoyment. I know a lot of tweens and teens that are still obsessed with dinosaurs!

The best part about involving them in making these Dinosaur Bath Bombs is that it is a fascinating chemistry lesson. Much like our original Hatching Dino Eggs was a great introduction to chemistry. These bath bombs are a great next step in hands on chemistry.

Make sure to check out: Hatching Dino Eggs – An Introduction To Simple Chemistry Activity

See just like Hatching Dino Eggs, the chemical reaction taking place in bath bombs is an acid and base reaction. And again, just like Hatching Dino Eggs, the bubbles are created by the release of CO2 gas. But in bath bombs things are a little different. Our acid is citric acid instead of vinegar. Citric acid is a dry powder and when mixed with baking soda the dry powders don’t react. In fact, nothing happens until you add the extra ingredient. That ingredient is water (for example a warm bath). Then your chemical reaction kicks into high gear!

See what I mean? The science is fascinating!! And what a great way to grow the theme with your kids!

Plus if you want to dig a little deeper into your chemistry you can explore how SLSA helps the bath bombs fizz and bubble even more. Or how polysorbate 80 is an emulsifier that helps oils and the colours mix with water, something they do not normally do well. This makes for a nicer bath experience, and helps prevent them sticking to the sides of your tub. The science lessons just keep piling up with this activity!

Want to learn more about how bath bombs work?

Check out some of our other bath bomb projects for even more lesson ideas including: Golden Snitch Bath Bomb, Glow in the Dark Bath Bombs (that have their own surprise inside!) and Mermaid Bath Bombs.

Homemade dinosaur bath bombs with a science lesson for kids

Homemade Dinosaur Bath Bomb Recipe

2 cups baking soda
1 cup citric acid
1/2 cup cornstarch
1/2 cup fine grade Epsom salts
1/2 cup SLSA (Sodium Laurel Sulfoacetate) This gives the bath bombs a little extra fizzy action!
1 teaspoon polysorbate 80
5 tablespoons coconut oil
2 tablespoons glitter (if desired, we recommend this biodegradable glitter for bath bombs)
Essential oils of your choice, we are loving citrus at the moment
Blue, green and orange mica powders
1 Large mixing bowl and 4 smaller bowls
Dinosaur egg mold
Spray bottle of rubbing alcohol

ValeforToy 72 Piece Mini Dinosaur Toy SetGrandmama's Goodies M255 Dragon Egg Scales Chocolate Candy Soap Mold with Exclusive Molding InstructionsAOND Colored Mica Powder for Soap Making Bath Bomb Dye Coloring Powdered Pigments Set for Makeup, Bath Bomb, Organic Soap Making(6 Colors)Milliard Citric Acid 5 Pound - 100% Pure Food Grade NON-GMO Project VERIFIED (5 Pound)Polysorbate 80 (Solubilser) 125 gramsSodium Lauryl Sulfoacetate (SLSA) (1.5 lb (24 oz)) by Earthborn Elements, Resealable Tub with Scoop, Bath Bomb Additive, Gentle on Skin, Long Lasting Foam & Bubbles


How To Make Dinosaur Egg Bath Bombs

In a large mixing bowl, add baking soda, citric acid, cornstarch, Epsom salts and SLSA.

In a small bowl add coconut oil, essential oils and polysorbate 80. Mix well. Then add to the large bowl and mix everything together until you achieve the texture of wet sand and the mixture forms a ball in your hand.

Separate the mixture evenly into the 3 smaller bowls.

Add the green mica to one bowl, the blue mica to another and orange to the third. Add the glitter if desired.

Incorporate color thoroughly into each bowl.

Start adding small amounts of each mix to the mold, pressing gently until the mold is filled halfway.

Place a dinosaur on its side and press down gently. Not too hard or it will show through the other side! Finish filling the mold. Press down firmly and continue to add small amounts until the mold is packed firmly and is filled to the top.

Allow dinosaur bath bombs to dry for at least 48 hours. this mold is larger than we normally use, so it requires much more time to set up and harden. If you feel the mold after 48 hours and it feels a bit damp, allow to dry another 24 hours.

To remove the bath bomb, place a plate or cutting board on the flat side of the mold and gently turn over. Gently twist the mold until the dinosaur bath bomb comes free.

Store in an air tight container, in a dry place until ready to use. If gifting, wrap in a plastic gift bag and tie tightly with a ribbon.

When you are ready to use, run a warm bath and drop in a dinosaur bath bomb. Watch carefully for your baby dinosaur to emerge from the egg!

Hatching dinosaur egg bath bombs

Dinosaur bath bombs DIY recipe with chemistry lesson


This simple chemistry lets little ones explore the exciting reaction between vinegar and baking soda.


Using items from the kitchen this fascinating experiment explores Acids and Bases and pH Levels. Kids will love digging through the pantry to test out whether items are an acid or a base, and explore pH levels of every day items. An excellent elementary experiment for hands on with science with lots of further studies.

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