This amazing color changing slime is going to blow your mind! This heat sensitive slime will actually change color as your kids touch it because it is heat sensitive! This fun science experment for kids is a great way to teach kids about thermochromatic pigment as they explore by play. This is a MUST TRY science activity for preschool, pre-k, kindergarten, first grade, 2nd grade, 3rd grade, 4th grade, 5th grade, and 6th grade students.
Color Changing Slime
I love kids activities that really WOW! You know the kind, where kids are impressed while they are completing the activity for kids, but also talk about it for days, weeks, and months afterwards. Those are my favorite things to try. I know we are not only having fun, but creating memories of epic childhood days playing and learning together with a science project for kids that will WOW! This color changing slime is definitely one of those cool projects for kids to try. It takes the fun of amazing, fun-to-play with slime up a notch… or two! They will have fun playing with this heat sensitive slime, watching the slime sheet, flow, ooze, and instantly come back together nice and neat. But thing amazing activity will actually change colors right before your kids very eyes!
And if you want to – you can even teach them about science in the process! Ready? All you need are a couple easy-to-get supplies and I will show you how to make heat sensitive slime. This science activity is loads of fun for preschoolers, kindergartners, grade 1, grade 2, grade 3, grade 4, grade 5, and grade 6 students.
Heat Sensitive Slime
This has to be one of the coolest play recipes ever! All you need is 5 ingredients and 5 minutes and you get to play with this color changing, heat sensitive SLIME! Kids of all ages – from toddler, preschool, pre k, kindergarten, first grade, 2nd grade, 3rd grade and more – will have fun exploring scientific principles of trial and error as they make cool patterns and changes in the color of the thermochromic slime.
Before you start, you need to decide what your color scheme will be for the slime. It will start out one color based on the thermochromic pigment you use (when the dough is cold), and change to an alternating color based on the food coloring you used (hot color). You wan to think color wheels when picking your colors as you will see variations of the colors as the hot and cold colors mix….Think color wheel neighbors to make the transition smooth. I used:
- Blue pigment with yellow food coloring (Slime is teal and turns yellow when hot)
- Red pigment with yellow food coloring (Slime is orangey red and turns yellow when hot)
- Blue pigment with red food coloring (slime is purple and turns pink when hot)
Color changing slime recipe
To make this THERMOCHROMIC Slime all you need are a few simple materials you can order on Amazon or pick up at your local Walmart.
- 1/4 cup white school glue
- 1 Tablespoons water
- 3 teaspoons Thermochromic pigment
- 1/4 cup liquid starch
- Food coloring
How to Make Heat Sensitive Sime
Okay, to make this color change slime, start by pouring 1/4 cup glue into a large bowl. Add 1 tablespoon water and stir until combined. Add 5 drop of food coloring (see above for ideas) and mix well.
Heat changing slime
Then add 3 teaspoons of thermochromic pigment and mix until uniformly distributed.
How to make color changing slime
Now add in 1/8 cup liquid starch (StaFlo) and mix until thick and slimy. Then knead the slime with your hands and return to the starch mixture for another mixing. This step is important because it makes sure there’s no unmixed glue hiding in the center of your slime ball.
If slime is still sticky, add additional starch a little at a time. Make sure to knead until it is no longer sticky. Most batches will use the entire 1/4 cup sta flo that is indicated in our slime recipe above.
Changing color slime
Store heat sensitive color changing slime in a glass or plastic container with a lid for up to one week. If you haven’t played with it for a couple of days you might need to add a little additional starch to it, one teaspoon at a time.
Want to see what this AMAZING color changing slime recipe looks like in action as your kids play? Keep scrolling….
Just like “traditional” slime, this slime is fun to knead, squish, watch pour into a pile and pick back up easily to play some more.
But unlike regular slime, this fun slime recipe will change colors as your child plays. The pigment reacts to heat. When the dough is cold it will be the color of the thermochromic pigment you used. But when your child touches it it will change to the color of the food coloring. Amazing right!
We taught you how to make color changing slime, but are you curious as to why it works?
This slime gets its color changing super powers from thermochromics pigment. As the temperature changes, Thermochromic materials change colors. You’ve probably seen this reaction before in mood rings, lipstick, and rubber duckies that tell you when the bath is too hot for babies.
There are two main types of thermochromics materials
- Liquid crystals – temperature changes cause the crystals to move, changing the spacing between them. This causes light to refract at different wavelengths, creating different visible colors.
- Leuco dyes – instead of changing the distance between crystals, temperature changes cause the dyes to change molecular structures. One form reflects colored light, the other colorless.
For older students, use this activity to get them thinking. Ask them questions like:
- Why do you think heat changes the slime?
- What happened when you touched the slime?
- Where have you seen other items that are heat sensitive?
Go a step further as you as children to come up with a couple experiments using the slime. Have them use the scientific method: ask a question, gather information and observe (research), make a hypothesis (guess the answer), experiment & test your hypothesis, analyze your test results, and present a conclusion.
- What will happen if we put an ice pack on the slime?
- What happens if we use a hair dryer to heat up the slime?
- If we let the slime dry out will it still change colors with temperature fluctuations?
Whether you are a parent, teacher, grandparent, homeschooler, or organizing a day camp / science camp – you will love this outrageously fun & easy to try activity for kids. The color and exploration possibilities are truly endless!
Looking for more fun-to-make easy slime recipes? You’ve got to try these slime recipes for kids:
- Heat Sensitive, Color Changing Slime
- Construction Slime Activities
- EASY Contact Solution Slime
- WOW 2 ingredient slime -our go to recipe
- Beautiful Rainbow Slime
- Edible, Gummy Bear Slime or this Cornstarch Slime with gummy bears
- Monsters Inc Slime with a zillion googly eyes
- Chocolate Goop
- Fluffy Unicorn Slime
Seasonal Slime Recipes
- Melting Snowman Slime
- Red Hot Valentines Day Activity Slime
- Valentines Day Glitter Slime
- Purple Valentines Day Slime
- Beautiful Gold Slime
- Glittery Green slime for St Patrick’s Day
- Leprechaun St Patricks Day Slime
- Easy Halloween Slime
- Gorgeous shimmery Gingerbread Slime
- Seriously green Mr Grinch SLime
- Fluffy Christmas Slime
Science for Kids
Looking for lots more fun, science experiments for kids? You’ve GOT to try some of these outrageously fun science experiments for kids! We have so many fun, creative and easy science experiments for elementary age children:
- 100 Amazing Food science experiments for kids – arranged by type of science
- Colorful Capillary action science experiment (also known as walking water)
- Amaze kids with these 12 Hands on Science experiments with batteries
- 24 Epic Solar system science projects to try this week
- Fun Water balloon science experiment that explores density
- 50 Fun Preschool science experiments the whole family will want to try
- Simple Galaxy science project
- Easy and Fun Dancing Raisins Experiment
- Learn about weather as you find how to make a weather vane
- Eye opening Eye science experiments
- Easy-to- make Air pressure science project
- Amazing POP rocks science experiment is one of our all-time favorite science experiments we like to do during the summer are
- Stunning Chromatography Flowers are so pretty you’ll forget it was as science project!
- How to Make a Lava Lamp – super easy and SO cool!
- 30 Simple machines science projects kids will want to try
- Easy, fascinating, and colorful project answering Why do Leaves Change Color Experiment
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- 19 Edible science experiments – which delicious project will you try first?
- HUGE Free Solar System Unit (coloring pages, hands on science projects, worksheets, and more!)
- Pipe Cleaner Constellation Activity (As seen on Good Housekeeping!)
- Teach kids about conductivity with this fun squishy circuits projects
- Amazing, Heat Sensitive, Color Changing Slime
- Life Cycles for Kids (from penguin to sunflower and spider to turkey we have LOTS of life cycles to explore and learn about)
- EASY, Colorful Oil and Water Science Experiment
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- This super cool Lego Zipline is fun and simple to make
- Human Body Project
- Check out this super cool look INSIDE a Volcano Project
- Exploding Watermelon – science experiment that explores potential and kinetic energy with a big WOW moment!
- Memorable Life Size Skeletal system science project – includes free printable template
- Find LOTS more Easy Science Experiments for kids of all ages!
Fun Summer Activities
Looking for more outdoor activities for kids and things to do in the summer? Your toddler, preschool, pre k, kindergarten, and elementary age kids will love these fun ideas to keep them busy all summer long:
- Marshmallow Shooters – go over 30 feet!
- Homemade Bubble Solution for GIANT Bubbles
- DIY Lava Lamp
- Pop Rock Science Experiment
- Grow Your Own Crystals
- Water Balloon Density Experiment
- Amazing Bubble Painting