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in Halloween STEM Activities

Become a Halloween Hero when You Make Boiling Blood Slime

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Kids will be fascinated by this boiling blood slime activity, and the topic of blood is perfect for Halloween or any other time you want to gross your kids out.

If you love Halloween AND science, you'll love this experiment to make blood boil! This boiling blood slime recipe is the perfect gross Halloween activity!

“You make my blood boil!”

Do your kiddos understand the expression?

Imagine what it would feel like if your blood actually could boil.

Guess what, there is a science activity for that!

Kids can learn how to make blood boil in this fun Halloween STEM activity.

All you need are a few common ingredients and the willingness to learn.

The best thing about this slime recipe is that it is non-traditional and requires NO borax, which means you can safely use it with kids of all ages!

 halloween stem challenges 

The Science of Boiling Blood Slime

An alka seltzer tablet is made up of dehydrated baking soda and citric acid.

When the tablet gets wet, the two ingredients react, creating carbon dioxide gas.

The gas is lighter than the slime blood, so it travels through the liquid to the top of the cup and out into the air.

However, the blood has to move out of the way, so the gas takes a little of the liquid with it, giving the appearance that the blood is boiling without the need for heat.

If you love Halloween AND science, you'll love this experiment to make blood boil! This boiling blood slime recipe is the perfect gross Halloween activity!

How to Make Boiling Blood Slime

Gather your science supplies and make boiling blood slime!

This post contains affiliate links for your convenience. 

 

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

  • Xanthan gum
  • Red food coloring
  • Alka Seltzer tablets
  • Science measuring cups

Heat about 2 cups of water in a pot.

Add a few drops of red food coloring. The more red you add, the darker your blood will be.

Sprinkle about 1/4 of a teaspoon of Xanthan gum on the hot water in the pot. Stir quickly to prevent clumping.

The water should thicken, but you don’t want it so thick that it can no longer boil.

Keep stirring until all lumps are gone.

Remove from heat and let cool completely.

If you love Halloween AND science, you'll love this experiment to make blood boil! This boiling blood slime recipe is the perfect gross Halloween activity!

If your blood mixture gets too thick after cooling, you can add a bit of water to thin it out.

Put the blood in your measuring cup.

Drop in a piece of alka seltzer tablet.

 If you love Halloween AND science, you'll love this experiment to make blood boil! This boiling blood slime recipe is the perfect gross Halloween activity!

Watch as the blood starts to bubble.

Keep adding tablets until the blood boils over the top of the container!

 halloween stem challenges 

Want More Halloween STEAM? 

Get the Spooky Science e-book!

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Filed Under: Halloween STEM Activities Tagged With: chemistry, elementary, halloween, slime

About Brenda Priddy

Brenda grew up thinking she hated science. But when her 4-year- old daughter was more interested in reading science facts than fairy tales, Brenda realized she had to learn more. Through simple at-home science experiments, Brenda developed a passion for science and now works as a STEMed advocate with a team of science educators to create hands-on STEM projects and curriculum for kids.

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What is STEAM?

STEAM activities for kids promote the idea that science, technology, engineering, art, and math can all work together to help kids become critical thinkers, problem solvers, and innovators!

Join us on our journey to discover just how much fun science experiments can be.

What we do… 

STEAMsational offers STEM and science lesson plans and teaching resources to provide a firm STEM foundation for children in the classroom or home.

All you need to do is find your supplies, gather your scientists, and let the innovation unfold.

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