How to Make Color Changing Slime




Introduction: How to Make Color Changing Slime

About: I work at instructables by day, and turn into a stitch witch by night. follow me on instagram @jessyratfink to see what i'm working on! ^_^

If you find yourself bored with regular slime recipes, color changing slime is a great new way to play! This slime is made using thermochromic pigment, allowing it to change color based on the temperature of the slime.

Thermochromic pigments are available in a wide variety of colors and temperature ranges, so you can change the color of the slime using cold or hot temperatures.

I especially like color changing slime because you can shift the colors over and over again - it never gets old watching the slime change instantly to a new color and fade back to its original color. :D

Step 1: Ingredients + Tools


Double check that the saline contact solution you're using has boric acid as an ingredient, otherwise the recipe will not work.


  • Bowl for mixing
  • Measuring spoons
  • Spoon for mixing
  • Small air-tight container for storing (optional)

Step 2: Combine the Glue and Baking Soda

Pour the glue into a bowl and add 1 tablespoon of baking soda. Stir it together until the mix is homogenous - you don't want to see any dry spots or clumps of baking soda!

Step 3: Add the Thermochromic Pigment

Now you'll want to add in 1/2 teaspoon of the thermochromic pigment. Stir the mix until you see no dry spots left - you'll probably need to scrape down the sides of the bowl to get all the pigment properly distributed in the glue.

Step 4: Add in the Contact Solution

Now you'll want to add in the contact solution one teaspoon at a time.

Add the first teaspoon and stir well. Then, add the second teaspoon and begin to stir. The slime mix will begin to clump together around the spoon and pull away from the sides of the bowl.

Step 5: Kneading the Slime

Remove the slime from the bowl - don't worry if it's super sticky. We'll fix that by kneading!

Knead the slime between your hands for a couple minutes until the stickiness fades and it becomes more solid. At this point, you can use the slime blob to clean any stray slime on your hands or in the bowl.

Step 6: Time for Color Changing!

Once your slime is done, you can change its colors in a variety of ways. Depending on the thermochromic pigment you chose, you'll need to either cool down (ice cubes) or heat up (body heat, hair dryer, warm/hot water) the slime.

In my case, the pigment changes from purple to teal at 92 F so I used hot water!

The best part about color changing slime is that you can heat it up and cool it down over and over - it's really fun to stretch and play with the slime until it returns to its normal color. :)

(The one caveat here: if you do use hot or warm water, don't worry about "drying" the slime off when you remove it from the water. The water won't cause any problems, but trying to dry it will. I ruined my first batch by fusing it accidentally to a paper towel. Whoops!)

Enjoy your slime and post pictures if you make it! :D



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    18 Discussions

    This is really good, but can you make a video of what it sounds like when you poke it, how it changes back and forth?

    oh my god! that is a perfect diy!


    11 months ago

    Pardon me for being British, but is Elmer's clear school glue a PVA type glue?

    2 replies

    About how many teaspoons of thermochromic powder do you get from 10g?

    5 replies

    You should be able to get 7 full teaspoons, give or take!

    I weighed out the amount needed for this recipe, and 1/2 teaspoon is 0.70 grams.

    I am away from my studio at the moment, but I will try to weigh it out and let you know when I get back!

    Thank you for the reminder! Sometimes I lose comments. :)

    My thermochromic powder measured out this way:
    1/2 tsp scoop, leveled = 0.70 grams

    I didn't know you could get this kind of powder! A little expensive but not that much, and it sounds like a little goes a long way.

    I bet it would be great to make some with powder that changes with body heat, then seal it in a plastic bag! If you could also make some with an oil base and a slightly different color-changing powder, and put them together in the bag, that might make some more neat effects.

    THIS IS AWESOME!!!!!!!!!!


    1 year ago

    I just did slime with my kids this past weekend, now I must try this :)

    Crazy amazing!!! Awesome instructable jessyratfink!

    This is AWESOME! I love things that color change :D