My kids love to play with slime! It’s one of our most used sensory materials in the classroom and at home.
We love finding new ways to play and encourage sensory play in the classroom, and our homemade fluffy rainbow slime recipe is always a crowd-pleaser.
If you’re looking for the perfect St. Patrick’s Day sensory activity, this fluffy rainbow slime recipe is the best and so easy to make!
It’s the perfect way to entertain your kids you can also use rainbow fluffy slime as a St. Patrick’s Day STEM activity!
Don’t miss our other fun slime recipes!
You can also make these slime recipes at home for science learning and play on the weekends, or during any holiday break.
Kids absolutely go nuts for the best slime recipes, and if you have slime lovers in your house, you don’t want them to miss out on making fluffy rainbow slime!
Check out the full list of summer slime recipes!
The Best Rainbow Fluffy Slime
What is Fluffy Slime All About?
Fluffy slime recipes are about more than just having fun with stretchy, gooey slime. Slime is a wonderful way to help children foster a love of science and chemistry.
The Science of Fluffy Rainbow Slime
Slime is formed when a chemical reaction between materials in the glue and the boron in the laundry starch or borax.
This reaction alters the chemical bond of the materials, combining them into long polymer chains.
This process is similar to how most flexible plastics are made today. Making a variety of slimes is also a good STEM activity experimenting with how different ingredients react to make a variety of slime textures.
Slime is also wonderful for kiddos who are sensory seeking, particularly for kids with SPD, autism, and ADHD.
Fluffy Slime Rainbow Tips
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If you’re in a bit of a rush though, just remember that brands matter when making slime.
While there are other ways to make slime, like with Borax powder and baking soda (we’ve never gotten contact lens slime to work), laundry starch slime is by far our favorite, and we will always recommend using it above any other recipe.
Why is My Slime Sticky?
Sticky slime usually means you don’t have enough activator. Try adding a bit more.
If that doens’t work, you may need to add something dry, like cornstarch, to help reduce how sticky your slime is. I like to add either cornstarch or shaving cream to eliminate stickiness.
If you can’t get enough of this fluffy rainbow slime, try our lucky coin slime or solid gold slime! Read on to learn how to make your very own rainbow fluffy slime.
Why is My Slime Watery?
If your slime is watery, you may not have enough activator! Try adding more and stir and see what happens. If it’s still watery, you may need to add a little more glue!
MAKE SURE TO CHECK OUT: THE COMPLETE LIST OF ST. PATRICK’S DAY STEM ACTIVITIES!
Fluffy Rainbow Slime Supplies
We like to stock up on big containers of these ingredients so we’re always ready to make slime!
You will need:
- Clear glue
- Sta-flo laundry starch
- Good brand food coloring
- Shaving cream
Purex Sta-Flo Liquid Starch, 64 Ounce (2)Elmer’s Liquid School Glue, Premium Clear, Washable, 1 Gallon, 1 Count – Great For Making SlimeFood Coloring Liqua-Gel – 12 Color Variety Kit in .75 fl. oz. (20ml) BottlesBarbasol Original Thick and Rich Shaving Cream for Men, 10 Ounce, Pack of 6AmazonBasics 16oz Disposable Plastic Cups – 240-Pack, Blue12 Ball Mason Jar with Lid – Regular Mouth – 16 oz by Jarden
SLIME BOOKS YOU’LL LOVE
Ultimate Slime: DIY Tutorials for Crunchy Slime, Fluffy Slime, Fishbowl Slime, and More Than 100 Other Oddly Satisfying Recipes and Projects–Totally Borax Free!The Slime Book: All You Need to Know to Make the Perfect SlimeThe Slime Workshop: 20 DIY Projects to Make Awesome Slimes―All Borax Free!Slime 101: How to Make Stretchy, Fluffy, Glittery & Colorful Slime!Slime Sorcery: 97 Magical Concoctions Made from Almost Anything – Including Fluffy, Galaxy, Crunchy, Magnetic, Color-changing, and Glow-In-The-Dark SlimeThe Book of Slime: 33 Recipes for Stretchy, Twisty, Squishy Fun!
We like to mix our slime either in mason jars or in disposable cups, so we can just throw them out once the slime is done!
How to Make Awesome Rainbow Slime
For this slime recipe, you’ll want to have six containers for mixing your slime- one for each color.
You can use disposable cups, mason jars, or bowls, but if you use disposable cups, you can just throw them away and you don’t have to clean!
In each cup, you’ll want to put in one color of the rainbow (red, orange, yellow, green, blue, or purple), one part glue, and one part shaving cream.
Sometimes I double the amount of shaving cream for two parts, but sometime’s that’s a bit much.
Read our detailed fluffy slime recipe for more fluffy slime tips.
Fluffy Rainbow Slime Recipe
Once your shaving cream and glue is mixed, it’s time to add the starch (you can also use contact lens solution if it contains a form of boron or boric acid).
Add starch slowly and keep mixing. If you add it all at once, the starch will be stringy, so add it a bit at a time. Once the slime is no longer sticky, you’ve added enough starch!
Stretch and play with the slime and have a rainbow of color to play with!
Pinch off small pieces to make a rainbow. When you mix them, the colors will slowly mix over time, but fluffy slime mixes more slowly than other colors.
And if you let a bunch of fluffy rainbow slime sit for a while, it looks like this!