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Color Changing Slime (No Borax)

Learn how to make color changing slime! Our guide shows you how to create mesmerizing, thermochromic slime for hours of sensory play.

Skills Required: None. You’re mixing ingredients in a container, and no crafting skills are required for this project.

color changing slime

Who knew that a little bit of science and creativity could blend together to create something as fun and engaging as color changing slime?

If you’re on the hunt for a fun, hands-on activity that combines the thrill of science with the joy of crafting, you’ve landed in the perfect spot. Today I’m going to share how to make thermochromic slime – a project that’s not only a blast to make but also incredibly fascinating to play with.

This recipe uses just three key ingredients: color changing glue, baking soda, and contact lens solution. It’s fun to create something that shifts colors right before your eyes, transforming with just the warmth of your hands!

Color changing slime is perfect for parties, science experiments, or just a rainy day at home when you’re in the mood for a boredom buster.

colour change slime

So, roll up your sleeves, gather your ingredients, and get ready to transform the ordinary into the extraordinary. Let’s dive into the magical world of color changing slime!

Tips for Making Slime

If you’ve never made slime before, here are some great tips you might be interested in. If you don’t need them, head on down to the recipe.

Measure Ingredients Precisely

The key to perfect slime is in the details. Measuring your ingredients as accurately as possible can make the difference between slime that’s just right and a recipe that’s too sticky or too brittle.

Add Mix Ins Slowly

If you’re adding color, glitter, or other fun elements, add them slowly and mix thoroughly to see the effect. You can always add more, but you can’t take it out once it’s in there.

Adjust Texture as Needed

If your slime is too sticky, add a little more activator (like borax solution, liquid starch, or saline solution). If it’s too stiff, add more glue or a bit of water. Do this gradually!

colour changing slime

Use Supplies You Don’t Mind Getting Messy

Slime can get everywhere, and while it’s usually easy to clean up, it’s best to use tools (bowls and utensils) and surfaces you’re not worried about.

Use Your Hands

Once the slime begins to form, use your hands to knead it. This helps improve the texture and mix everything evenly. Don’t be afraid to get a little messy!

Storage is Key

Keep your slime in an airtight container when not in use. This will help it last longer and prevent it from drying out.

Safety First

Always use safe, non-toxic ingredients, and if you’re crafting with younger kids, make sure they’re supervised, especially with ingredients like borax.

slime changing color

Slime making is all about experimenting and having fun, so don’t be afraid to try new things and see what works best for you. Enjoy your crafting! Here’s what you’re going to need:

Gather These Supplies

  • Color changing glue – 1 bottle (5 oz)
  • 1/2 teaspoon baking soda
  • 1 Tablespoon contact lens solution

Tips and Thoughts for This Craft

This slime change color based on temperature. So roll it around in your hands, and it should change color based on the heat from your skin.

Store your slime in an airtight container or baggie. If your slime gets stiff, you can try to add a little water – lotion – hand sanitizer – or even a bit more glue to soften and reactivate it.

thermochromic slime

The way that it changes colors is so cool! Get the recipe below:

Yield: 3/4 cup

Color Changing Slime

colour changing slime

Your kids will love this slime that changes colors! Learn how to create this mesmerizing, temperature-sensitive slime that transforms before your eyes.

Prep Time 5 minutes
Active Time 10 minutes
Total Time 15 minutes
Difficulty Easy
Estimated Cost $1


  • Color changing glue - 1 bottle (5 oz)
  • 1/2 teaspoon baking soda
  • 1 Tablespoon contact lens solution


  • Mixing bowl
  • Stir stick


  1. Empty the bottle of color changing glue into the bowl. Make sure to let all the excess glue drip out (keep upside down for a minute or so).Add the color changing glue to the bowl
  2. Add baking soda to the color changing glue.Adding to the baking soda to the blue glue
  3. Add contact lens solution to the glue and baking soda.Adding the contact solution to the glue mixture
  4. Stir the ingredients in the bowl with a stir stick until combined.Stirring the glue mixture with a stir stick
  5. When the slime is too difficult to stir, remove it from the container and continue kneading it the rest of the way with your hands to finish.Kneading the colour changing slime with hands


Costs for this craft will vary - if you make a lot of slime like we do and buy the ingredients in bulk, it can cost pennies!

Did you make this project?

Please leave a rating or share a photo on Pinterest!

I hope you enjoyed this fun activity! Please let me know what you think in the comments. I’d love it if you’d go check our other slime posts:

ClayLaundry DetergentGlitterGlow in the DarkHalloweenPlay DohSlime Shops

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