Nothing says Valentine’s Day like hearts and slime. If this is your first time stopping by our site, you will see how much we love making slime. If you have seen our slime ideas before, you know that we just had to share a Valentines Day Heart Slime with you and your kids. Slime is cool science and sensory play all rolled into one simple to make slime recipe.
EASY VALENTINES DAY HEART SLIME FOR KIDS
HEART SLIME AND SCIENCE
Slime is a cool science activity to share with kids and making slime is much simpler than you might think. Our Valentines Day heart slime is perfectly festive for the special occasion. We love our Valentine’s Day Science Activities.
Slime making is even more fun when you add in creative themes for special occasion days like Valentine’s Day. We have quite a few slime ideas to share, and we are always adding more. Our Homemade Confetti Heart Slime Recipe is yet another AMAZING slime recipe we can show you how to make.
VALENTINES SLIME CHEMISTRY FOR KIDS
Read all about the terrific chemistry behind the slime! Our post is great for introducing young kids to the wonderful world of polymers and contains some useful information and resources for the older kids too. You can also read more on the science below.
We always like to include a bit of homemade slime science too, and that’s perfect for exploring Valentine’s Day STEM. Slime is an excellent chemistry demonstration and kids love it too! Mixtures, substances, polymers, cross linking, states of matter, elasticity, and viscosity are just a few of the science concepts that can be explored with homemade slime!
What’s the science behind the slime? The borate ions in the slime activators (sodium borate, borax powder, or boric acid) mix with the PVA (polyvinyl-acetate) glue and forms this cool stretchy substance. This is called cross linking!
The glue is a polymer and is made up of long, repeating, and identical strands or molecules. These molecules with flow past one another keeping the glue in a liquid state. Until…
SLIME IS A NON-NEWTONIAN FLUID
When you add the borate ions to the mixture, it starts to connect these long strands together. They begin to tangle and mix until the substance is less like the liquid you started with and thicker and rubberier like slime! Slime is a polymer.
Picture the difference between wet spaghetti and leftover spaghetti the next day. As the slime forms the tangled molecule strands are much like the clump of spaghetti!
Is slime a liquid or solid? We call it a Non-newtonian fluid because it’s a little bit of both! Experiment with making the slime more or less viscous with varying amounts of foam beads. Can you change the density?
CHECK OUT: More Valentines Day Slime Ideas.
VALENTINE’S SLIME TIPS
The base for this confetti heart slime uses one of our most basic slime recipes which is clear glue, water, and liquid starch.
Our easy, “how to make” slime recipes will show you how to master slime in 5 minutes! We have spent years tinkering with our 4 now 5 favorite basic slime recipes to make sure you can make the BEST slime every time!
We believe learning how to make slime shouldn’t be disappointing or frustrating! That’s why we want to take the guess work out of making slime!
- Discover the best slime ingredients and get the right slime supplies the first time!
- Make easy fluffy slime recipes that really work!
- Achieve awesome squishy, slimy consistency the kids love!
BEST SLIME MAKING RESOURCES
We have the best resources to look through before, during, and after making your Elf on the Shelf slime! Make sure to go back and read the slime science above too!
- BEST Slime Supplies
- How To Fix Slime: Troubleshooting Guide
- Slime safety Tips for Kids and Adult
- How To Remove Slime from Clothes
- Master Your Slime Training Series
VALENTINES DAY HEART SLIME SUPPLIES AND INGREDIENTS
SUPPLIES NEEDED FOR LIQUID STARCH SLIME
I always encourage my readers to read through the recommended slime supplies list before making slime. Learn how to stock your pantry with the best slime-gredients.
Where Do I buy Liquid Starch?
We pick up our liquid starch in the grocery store! Check the laundry detergent aisle and look for the bottles marked starch. Ours is Linit Starch (brand). You might also see Sta-flo as a popular option. You can also find it on Amazon, Walmart, Target, and even craft stores.
“But what if I don’t have liquid starch available to me?”
This is a pretty common question from those who live out of the United States, and we do have some alternatives to share with you. Click on the link below to see if any of these will work! Our saline solution slime recipe also works well for Canadian and UK readers.
1/2 Cup of Elmer’s Washable PVA Clear Glue or White Glue
1/4 Cup of Liquid Starch
1/2 Cup of Water
Food coloring, confetti, glitter, and other fun mix-ins
VALENTINES SLIME RECIPE DIRECTIONS BELOW
This fun heart theme slime activity calls for one batch of our easy liquid starch slime recipe. You can make more or less depending on your own creative ideas! See how we swirl multiple colors together here.
The best slime recipe starts with the right slime ingredients. Make sure to follow along with our measurements. Start by adding your glue and water to a bowl and grab a mixing utensil. Mix it up and add food coloring, glitter, and confetti as desired!
For this Valentines Day heart slime we mixed in red glitter and confetti hearts.
BEST SLIME ACTIVATORS
Add in your slime activator (baking soda and saline solution) to complete the chemical reaction you read about above in the science behind the slime section. If you scrolled past it, go back and read it with your kids!
What does the baking soda do? It adds the firmness the mixture needs so you can pick it up. This ingredient is a great variable to tinker with for a science experiment!
You can also learn more about all our favorite slime activators here. Keep in mind that liquid starch, saline solution, and borax powder are all in the boron family. Neither of these ingredients are truly borax free.
LIQUID STARCH SLIME STEPS
Make sure to read about the science behind the slime below! NEW! Slime troubleshooting guide (great to read before making slime too)!
STEP 1: In a bowl mix 1/2 cup water and 1/2 cup of glue (mix well to combine completely).
STEP 2: Now’s the time to add color, glitter, or confetti! Remember when you add color to white glue, the color will be lighter. Use clear glue for jewel toned colors!
You can never add too much glitter! Mix the glitter and color into the glue and water mixture.
STEP 3: Pour in 1/4 cup of liquid starch. You will see the slime immediately start to form. Keep stirring until you have a gooey blob of slime. The liquid should be gone!
STEP 4: Start kneading your slime! It will appear stringy at first but just work it around with your hands and you will notice the consistency changes. You can also put it in a clean container and set it aside for 3 minutes, and you will also notice the change in consistency!
STEP 5: Enjoy your slime!
MORE SLIME MAKING RESOURCES!
You will find everything you ever wanted to know about making homemade slime right here, and if you have questions, just ask me!
If you want to do something a little more than cutting out paper hearts this Valentine’s Day, try making our homemade slime instead. Host a slime party and give out slime party favors! Kids love slime.
STORING YOUR VALENTINE’S SLIME
Pictured above, you will see that we used the plastic refillable ornaments for storing our elf slime. This make great party gifts too! Or gifts for kids to make for their friends.
Slime lasts quite awhile! I get a lot of questions regarding how I store my slime. We use reusable containers in either plastic or glass. Make sure to keep your slime clean and it will last for several weeks. I love the deli style containers in my recommended slime supplies list here.
If you want to send kids home with a bit of slime from a camp, party, or classroom project, I would suggest packages of reusable containers from the dollar store or grocery store or even Amazon. For large groups we have used condiment containers as seen here.
VALENTINES DAY HEART SLIME FOR KID’S SCIENCE
Click on the photo below for more awesome STEM activities to try with your kids.