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Science and Spooky Collide in this Skull Slime Recipe

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One of my favorite things to do is bring each season into the classroom in a fun and hands-on way. During Halloween, Halloween STEM activities are a fun way to bring the creepy side of Halloween into the classroom. 

Nothing is slimier and grosser than slime recipes, and we’ve made the science experiment even grosser by adding skull and cross bone erasers to it.

Skull slime is one of our favorite Halloween slime recipes for a Halloween party, or a super fun party favor. It’s classroom-friendly nature makes it perfect for science lessons during October.

Mix science and Halloween when you make skull slime and turn it into a Halloween STEM activity! Kids of all ages will love this creepy science experiment.

Kids will think you are the coolest teacher ever if you let them play and learn with this spooky slime.

How to Make the Skull Slime Recipe

The skull slime recipe is a slight variation on our classic laundry starch slime recipe.  Make sure to read that post for all the tips you need to make your slime come out perfectly every time.

As a brief overview, however, when we make slime, we use a 1:1:1 ratio with water, starch, and glue.

Using this ratio, the slime comes out perfectly almost every time.

What Kids Can Learn By Making Slime

Mix science and Halloween when you make skull slime and turn it into a Halloween STEM activity! Kids of all ages will love this creepy science experiment.

Typically, we focus on the science of polymer bonds when we make slime, but this time, I wanted to focus on something a little different.

This time when making slime, we focused on intermolecular forces, and how and why different molecules will bond in certain ways. In the case of slime, the borax in the laundry starch mixes with the molecules in the glue, creating covalent bonds.

Once bonded, the two ingredients will not come unbonded.

What you’ll need to make skull slime:

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slime science lesson

Elmer's Liquid School Glue, Premium Clear, Washable, 1 Gallon, 1 Count - Great For Making SlimeElmer’s Liquid School Glue, Premium Clear, Washable, 1 Gallon, 1 Count – Great For Making SlimeFood Coloring Liqua-Gel - 6 Color Rainbow Kit in .75 fl. oz. (20ml) BottlesFood Coloring Liqua-Gel – 6 Color Rainbow Kit in .75 fl. oz. (20ml) BottlesPurex Sta-Flo Liquid Starch, 64 OuncePurex Sta-Flo Liquid Starch, 64 OunceOriginal Stationery Arts and Crafts Glitter Shake Jars, Extra Fine, 24 Multi color SetOriginal Stationery Arts and Crafts Glitter Shake Jars, Extra Fine, 24 Multi color Set

halloween stem challenge cards

Skull Slime Recipe Directions

Mix science and Halloween when you make skull slime and turn it into a Halloween STEM activity! Kids of all ages will love this creepy science experiment.

My preschooler added green play dough to our skull’s eyes to make them more dramatic. She was definitely wanting to up the creep factor.

Mix your food coloring, glue and water in a container.

Add the starch.

Mix science and Halloween when you make skull slime and turn it into a Halloween STEM activity! Kids of all ages will love this creepy science experiment.

Mix until it is no longer sticky and pulls easily between your fingers. Depending on the day, this can take just a minute, or up to five minutes.

Once the slime is stretchy and doesn’t stick to your fingers, it’s ready to play with.

Add the bones, and let the learning begin!

Mix science and Halloween when you make skull slime and turn it into a Halloween STEM activity! Kids of all ages will love this creepy science experiment.
 
halloween stem challenge cards

More Halloween Slime Ideas

Eyeball Slime

Blood Slime

Zombie Slime

Halloween slime jars

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