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Halloween Slime

Spooky recipes for Halloween Slime

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Halloween and slime go hand in hand, so our Slime-ologists at the Spangler Science Labs have been hard at work developing new slimy recipes. Everyone knows about slime made with Elmer's Glue, but our PVA formula makes the best slime you've ever seen... it's truly the recipe for the slime connoisseur. Check out these spooky slime recipes for slime that crunches, cracks, bursts, and oozes.

  • Clear Slime
  • Green Slime
  • Styrofoam Balls
  • Glow Powder (Zinc Sulfide)
  • Atomic Glow
  • Jelly Marbles
  • Orbs
  • Black light
  • True Colors Color Mixing Tablets
  • Large mixing bowl


  • Halloween Slime - Cool Halloween Science
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A great way to mix slime in large batches is to use a large mixing bowl... don't be afraid to get messy because you'll need to stick your hand right in the bowl and start mixing that slime!

  1. For a good sized batch of slime, measure 240 mL (8 oz) of PVA solution and 60 mL (4 Tbsp) of Borax solution (a supersaturated mixture of Mule Team Borax and water) in the bowl.
  2. Dig those hands in and start squishing the liquids until they start to change textures and form slime. Your mixture may feel a little runny at first, but as you continue to mix, you will get just the right consistency.
  3. When you are done mixing, you should have a perfect batch of Clear Slime. But you aren't done yet! Try the following recipes to make the best spooky slime ever.

Snake Eyes Slime

  1. Follow the mixing directions above but add a couple handfuls of styrofoam beads to the PVA solution before you mix in the Borax.
  2. For extra scary slime, try using our Green Slime Kit or color the clear PVA solution with food coloring or True Colors Tablets.

Lizard Eyes Slime

  1. Hydrate one or two scoops of Orbs overnight in a separate container.
  2. The next day, mix your slime using the above mixing instructions.
  3. Once your slime is the right consistency, flatten it out in the bowl.
  4. Pour the Orbs out of the container and dry them off with a piece of paper towel.
  5. Put the Orbs on top of your flattened slime and gently fold them in.
  6. When your Orbs are completely mixed into the slime, they will ooze and pop as you play with your creation.

Eyeball Slime

  1. Hydrate one or two scoops of Jelly Marbles overnight in a separate container.
  2. The next day, mix up a batch of clear or colored slime using the above mixing instructions.
  3. Pour your Jelly Marbles out of the container and dry them off with a paper towel.
  4. Plop the Jelly Marbles in the slime in the bowl and mix them together with your hands.
  5. As you start to mix, your Jelly Marbles will latch onto the slime and start to look like eyeballs dripping out of the ooze.

Glow in the Dark Slime

  1. When mixing your slime, add approximately 1 teaspoon of Glow Powder to the PVA before adding the Borax solution.
  2. When you are done mixing, you will have a light green batch of slime.
  3. Hold the slime up to a light or a black light for 60 seconds or so.
  4. Turn off all the lights and your slime will glow in the dark!
  5. Use your glowing slime as a fun "trick" on Halloween night... take it Trick or Treating and "recharge" its glowing power at each porch light!

Atomic Slime

  1. When mixing your slime, add a few drops of Atomic Glow to the PVA before adding the Borax solution.
  2. After your slime is mixed, it will be an eerie, yellow color. Wash your hands thoroughly after mixing as Atomic Glow can stain.
  3. Turn off all the lights and flip on your black light.
  4. Your slime will give off an amazing greenish-yellow glow... but only when it is under the black light!

More Spooky Ideas

Try mixing in small party favors such as plastic spiders, plastic candy decorations, and anything else you can imagine for a super spooky batch of slime.

How Does It Work?

Making slime is a great way to teach about the properties of a polymer (or a long chain of molecules). The PVA molecules start out as a liquid in this slime recipe but are quickly hooked together with the introduction of the Borax (the chemical name for Borax is sodium tetraborate). Scientists refer to the Borax solution as the "cross-linker" in the creation of the Slime polymer. Borax molecules are like tiny paper clips that hook together the long chains of PVA molecules making a slippery, gooey concoction known as Slime. This is a very simple explanation of hooking the molecules together, but if you want a more detailed scientific explanation, just keep reading (while you keep playing with the slime).

Because you mixed two liquids together, there’s a good chance that slime is a colloid, and it is! But, there’s more to it than that and your kids need to understand how the molecules behaved in order to grasp it all. For starters, most liquids, such as water, are made up of small, unconnected molecules bouncing around and tumbling over and into one another. Single molecules are called monomers. Monomer liquids flow easily and are seldom gooey or sticky to the touch.

In other substances, the monomers are linked together in identical, repetitive segments that form long chains of molecules known as polymers. These long chains don’t flow over and across one another very easily. Like a bowl of cooked spaghetti, they sort of roll over and around one another but they’re not linked to each other. Liquid polymers tend to be gooier and flow more slowly than liquid monomers. The PVA used in this activity is a liquid polymer.

You might use this analogy to help the kids understand what happened. Picture a box full of tiny, steel chains that slip and slide easily across one another. Each chain is made up of hundreds of individual links, but one chain is not connected to another chain. If you reach in and grab one chain and pull it out, that’s what you get: one chain. Suppose you stir a whole bunch of tiny magnets into the box of chains. The magnets randomly connect the chains together in many locations, making a single, large blob of chains. Now if you reach in and grab one chain, you’d lift out the entire pile. Adding Borax solution to the PVA does pretty much the same thing (only it’s a chemical, not a magnetic connection). Borax loves to connect with water and billions of Borax molecules randomly link trillions of water molecules found anywhere on the chains of PVA. Now when you pull out one PVA chain, all the rest come with it in a blob. In the chemical reaction that the kids made, they got a slow-moving, glistening mass that’s known as a hydrogen-bonded, cross-linked polymer gel. Slime is way easier to say.

In an effort to understand the world around them, scientists design models of what they can’t see in order to understand and explain what they can see. The idea is to figure out how various molecules inside materials are arranged to produce the observable results. In general, molecules can be “seen” only with some serious electronic help and these images serve only to assist with the inferences of the model. If your kids understand how this inference modeling works, then they’re way ahead of the game in their understanding of molecules.

Customer Reviews

Enjoyed by all Review by Marianne

My class enjoyed making slime. All my other classes want to do it now.

(Posted on October 2, 2009)

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