Easy Oobleck Recipe Using Conversation Hearts: Perfect for Valentine's Day!

Valentine’s Day is filled with fun and science when you make this conversation heart oobleck recipe! Kids will love making this!

If your kids love oobleck, they they will love this fun version made with conversation hearts! Try it with your kids this Valentine’s Day if you have more conversation hearts than you know what to do with. It’s a fun Valentine STEM activity that kids will want to try over and over!

Related: Valentine’s Day STEM Activities and Science Experiments

Easy Oobleck Recipe Using Conversation Hearts

This easy oobleck recipe is not only fun, but it also teaches kids about non-Newtonian fluids.

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What you’ll need to make the easy oobleck recipe:

Conversation hearts
Kitchen mallet (you can also use a rolling pin)
Gallon-sized zip lock baggie
Cornstarch
Small container
Play tray

First, place your conversation hearts into a plastic bag and seal it up. Hammer the bag with your Kitchen mallet until the hearts become a fine powder.

Mix your conversation heart powder with the cornstarch in a 2 to one ratio. If you have one cup of heart powder, add two cups of cornstarch.

Add just enough water to form a malleable liquid.

Pour out your oobleck onto the play tray.

Give your kids more conversation hearts to play with in the oobleck.

My preschooler liked placing the hearts on the surface of the oobleck and watching them slowly sink to the bottom.

The oobleck is slightly stickier than regular oobleck due to the addition of the sugar, but it also smells great!

What Kids Learn Making Oobleck

Oobleck is a slime that has properties of both a solid and a liquid. Isaac Newton thought that substances were either solid or a liquid. He didn’t realize that a lot of solutions can have both properties of a solid and of a liquid. This is why anything that can act like a solid and a liquid is called a “non-Newtonian” fluid.

Cornstarch slime is a classic, because when you hit it or press it, it freezes up and acts like a solid. But as soon as you let go, it drips off your fingers just like a liquid.