How to Make Magnetic Slime Recipe – STEM Activity for Kids

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magnetic slime recipe with magnet

This homemade magnetic slime recipe is EASY to make but requires adult supervision. Below you’ll learn how to make magnetic slime plus find other easy magnetic activities for kids!

Last year my son sold slime at a kid’s entrepreneur event and spent months perfecting his slime recipes. This easy to make homemade magnetic slime recipe is by FAR his favorite and a stronger magnetic slime than any slime we have found on the market to buy.

He has made a lot of batches of slime trying out the best strength for magnetic slime and this recipe is the winner!

handful of magnetic slime sensory play

Magnetic Slime Recipe Ingredients:

1/2 cup of Elmer’s School Glue
1/2 cup Shaving Cream (NOT shaving gel, just cheap regular shaving cream)
1 Tbsp. Cornstarch
3 pumps any Hand or Body Lotion
1/2 tsp. Iron Filling (Buy a small bag here or a large bag here)
1.5 cups Liquid Starch

black magnetic slime recipe for sensory

Magnetic Slime Directions:

In a medium bowl:

1. Add 1/2 a cup of white school glue.
2. Add 1/2 cup of shaving cream.
3. Add one tablespoon of cornstarch.
4. Add 3 pumps of any Hand/Body Lotion.
5. Mix the four and add 1/2 a teaspoon of black iron oxide powder*.
6. Add half 1 1/2 a cup of liquid starch to a container mix, mix, then add any remaining starch as needed for the perfect consistency, and let it sit for 30 minutes.
7. Add the rest and mix well.
9. Play with the slime!

*TIP – I strongly recommend adult supervision when opening and using black iron oxide powder! It can be easy to accidentally inhale and you will want to hold the bag far away from your face as this is an iron filling. You do NOT want any powder dust near your face! Once it is mixed thoroughly into the slime it is OK to use!

homemade diy magnetic slime recipe

This magnetic slime recipe stores AWESOME in any airtight storage container. My son has kept his for up to 6 months or more with no issues. Although you might be tempted to add a ton more iron filling to see how fast your magnetic slime can move I’d add the word of caution that the black iron oxide powder can tend to leave black marks on your hand if you are using it in too high of a quantity! This recipe does NOT leave extra fillings or colors on your hands!

*NOTE – over time the iron oxide will separate in the slime mixture. All you need to do is stir it up or mix it well and your slime will be as good as new!

magnet on magnetic slime recipe

Any size magnet works but we bought a super strong square magnet for a bigger WOW effect! It’s unbelievable – it looks like a blob from a movie just crawling up and around the magnet! My son was incredibly excited because he had purchased magnetic slime before and it was so lousy compared to this homemade magnetic slime recipe he created!

magnetic slime with magnet experiment


Roll a bit of your magnetic slime up like you see above and hold your magnet ABOVE it. We were able to make our magnetic slime “WAVE” back and forth as we moved the magnet in an arch pattern above the slime! You can see this magnetic pattern shown in the video!

Buy Magnetic Slime ingredients here!

Other Magnetic Activities:

FREE Magnetic Camping Playset
Hanging Magnets
Magnetic Pom Poms
Glow in the Dark Magnetic Constellations
Magnetic Pioneer Dress Up Doll

Magnetic Educational Toys:

PIN IT HERE –>magnetic slime recipe photo tutorial

Other Learning STEM Activities:

solder kit and boy soldering5 Simple Light Table ActivitiesCoolest Science Animal Anatomy Model Kits for Kids

Magnetic Sand at a California Beach:

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  1. Beckie Rodgers says:

    We want to make this for a science experiment for 60 kids, how much does this recipe make?

    1. Hi Beckie! This recipe makes roughly enough slime for about 4-6 ounces (It looks good in an 8 oz. container). So it would depend on the size of your cups. If you’re making the small condiment cups for 60 kids I’d start by multiplying this recipe out by 6 and then go from there so you don’t make to much. You’ll probably need an additional batch but it’s VERY quick and easy to whip up!

  2. Carrie Steins says:

    Hello! Can you use any liquid starch or
    Does it have to be Staflo?? Thank you for your help!!

  3. Kara Dahl says:

    Hi there! We are making this tomorrow with fourth graders for science. I need some clarification on the liquid starch part of the recipe. Does it mean to add HALF of the total amount of liquid starch, let it sit, and then add the OTHER HALF? (Adding 3/4 c. each time for a total of 1 1/2 c.)?
    Please help!
    Thank you so much!

    1. Hi Kara! Sorry I should have clarified that better and updated the post! Begin by mixing half in and then add little bits of the remaining amount until you achieve the desired consistency! 🙂 Sounds like you have an awesome project planned!

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