How to make chocolate slime

Has the slime craze taken over in your house? I love simple slime recipes that are easy to make at home, so I thought I’d share my chocolate slime recipe with you. Making slime is a great sensory experience and a brilliant opportunity to talk about science and get kids excited about chemistry. If you want to know more about the science behind slime I cover it at the end of this blog post.


  • 1/2 cup of white PVA glue
  • 1/2 cup of water
  • 1/4 – 1/2 teaspoon bicarbonate of soda
  • Cocoa powder
  • 1 tablespoon saline solution (must contain boric acid and sodium borate). I use this brand of saline solution (affiliate link).


  • Bowl
  • Measuring cups
  • Spoon

Chocolate Slime Recipe

  1. First add the glue, water and cocoa powder to your bowl and mix together well.
  2. Then add the Bicarbonate of soda. Bicarbonate of soda helps to firm up the slime, so you can play around with how much you need, based on how firm you want your slime to be. 
  3. Next, add the saline solution. The saline solution is the slime activator. If you use too much your slime will be too rubbery and not stretchy enough, so measure carefully.
  4. You need to stir very quickly to activate the mixture. As you’re stirring you will notice the thickness change.
  5. Once the slime starts pulling away from the edges of the bowl you can start kneading it. It may be quite sticky to start with, but will become less sticky very quickly and will continue to thicken after it’s made.

WARNING: Slime is a chemistry experiment and should be treated with respect. Adult supervision is recommended at all times. Please do not substitute slime ingredients or change the recipe. If you have sensitive skin, please wear disposable gloves.

What’s the science behind slime?

The saline solution contains sodium borate or boric acid. The PVA glue is a polymer and is made from long, repeating strands, or molecules. When the saline solution mixes with the PVA glue they cross link. This means that the borate ions, start to connect the long strands of the polymer together. So rather than the molecules flowing past each other, in a liquid state, they begin to tangle, creating a rubbery, stretchy, slime mixture.

Storing chocolate slime

You can store your chocolate slime for a long time. Just keep it clean and covered.

How do I get slime off my clothes, or hair?

You can remove slime from clothes or hair using white vinegar.

Other blog posts you might like

We made this slime as part of my Winter Art & Sensory Challenge.

You can find more sensory ideas on my Sensory Activities Pinterest Board.

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Blissful Domestication


  • Josie – Me, Them and the Others Posted March 7, 2019 4:09 pm

    This is genius, my kid’s love slime and chocolate so will adore this! #kidsandkreativity

    • Debbie Denyer Posted March 7, 2019 5:22 pm

      Thanks Josie. It smells gorgeous! I hope you have lots of fun if you try it.

  • Bryony shaw Posted March 14, 2019 1:00 pm

    This looks super fun.. and messy 🙈😂 #kidsandkreativity

    • Debbie Denyer Posted March 14, 2019 5:17 pm

      Thanks Byrony. It smells amazing too!

  • Kerry Posted March 14, 2019 2:28 pm

    We are big slime fans, and it’s often a weekend past time for us experimenting with new recipes. Not tried chocolate yet though! Thanks for inking up to #KidsandKreativity, hope to see you next time

    • Debbie Denyer Posted March 14, 2019 5:18 pm

      It’s such a great way of teaching kids about science isn’t it?

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