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Time4Learning Demos

Gak, Flubber, Silly Putty, & Slime Recipes

*This post contains affiliate links. Things you buy through our links may earn us a commission.

Certain substances act like a liquid until pressure is applied, and then they appear to be solid. Others are stretchy or bounce. The scientific name for these substances is “Polymers.” How to do polymer experiments safely as a fun, homeschool experiment.

Recipes for:

Safety and Purchasing of materials

Neon Gak Recipe

Ingredients for Gak:

Pour glue and coloring in plastic container.

Stir until color is thoroughly mixed in.

Add starch a little at a time, stirring with a spoon or kneading with your fingers as mixture thickens.

Keep stirring until mixture holds together like putty.

Test with your fingers: if too sticky, add more starch in small amounts until mass is smooth and rubbery.

Clear Gak Recipe

Ingredients for Clear Gak:

Pour 1 cup liquid starch into plastic container with tight-fitting lid, and give it a good long shaking before adding glue.

Add in the 1 cup CLEAR glue, and mix with fingers.

Keep trying to pull and stretch it as you are mixing it.

Oobleck Recipe

Another interesting substance is called “oobleck.” It also acts like a liquid until pressure is applied. Oobleck is gluten-free as it is made with cornstarch. This recipe also has link to natural decorating colors for those who may be sensitive to dyes.


Gloopy oobleck
Most liquids’ viscosity changes because of temperature. But non-Newtonian fluids’ viscosity changes because of pressure. Scientists haven’t decided yet what makes oobleck behave like this.

Safety of Borax

The following recipes contain Borax, which is a toxic substance. The experiments should not be done in the kitchen nor near food or food preparation areas. Limit the time children are exposed to it, and tell them never to put it near their mouths, nor eat until their hands are washed. If they have an upset stomach or rash afterward, push fluids, and the symptoms should go away. When interest has waned, use to kill ants somewhere away from children and pets.

Amy’s Flubber Recipe

Amy found this one that worked very well. Needs bowls.

Mix thoroughly

In a separate bowl, mix thoroughly:

  • 1 1/3 cups very warm water
  • 2 level teaspoons Borax

Mix the contents of the two bowls together kneading until it is fully combined. Discard any remaining liquid.

Fluffy Slime

The latest craze that kids are into is homemade slime. They record themselves making it and then they post it on Instagram. There are thousands of slime-themed Instagram accounts that get millions and millions of views so Jimmy invited some adorable slime-obsessed kids along with the famous girls from @Glitter.Slimes and @SlimeQueeens to explain what it’s all about and to show him how to make some slime.
~Jimmy Kimmel Live

Making slime videos is all the rage on Instagram. Here’s what you need to make some fluffy slime.

  • Pour a 1/2 cup Elmer’s glue into a bowl
  • Add a few drops of food coloring. (Which can stain hands or clothes!) Stir in.
  • Shake shaving cream well, and then add about 3-4 cups into glue.
  • Stir in 1/4 teaspoon baking soda.
  • Stir in 1 tablespoon saline solution and mix. (Note: must contain sodium borate/ boric acid as ingredients)
  • Mix with a large spoon until mixture leaves the walls of the bowl, then kneed it with your hands. Wear latex gloves if you don’t want your hands to acquire color of food coloring.
  • To make slime less sticky, add a few drops of baby oil.

To make the slime pop, add beads. Add glitter to make it shiny.

Here’s a reasonably priced tripod for an SmartPhone to help you make a video.
Acuvar 50″ Inch Aluminum Camera Tripod and Universal Smartphone Mount
For best videos, remember to have your camera in landscape (sideways) orientation.

Do NOT eat it! You will vomit!

Glorax (Flubber) Recipe

  • Put 3 T. of water into a Ziploc bag.
  • Add 1 T. of white glue.
  • Add 2 heaping T. of Borax (laundry detergent). It must be Borax.*

Shape into a ball. If the mixture is too sticky, roll the ball in a little bit of Borax. Enjoy stretching this elastic substance.

Silly Putty Recipe

This will bounce and pick up pictures from the paper just like the name-brand stuff.

  • Add: 1/2 cup water to 1/2 cup Elmer’s glue (Not School Glue!)
  • Mix and add 3 drops of food coloring (optional)
  • Make Borax solution: Take 2 tablespoons borax (You can buy this at a grocery store or online) and add to 1 cup of water and stir.
  • Add 1/2 cup of Borax solution to water and glue mixture
  • Stir and store in a plastic bag

Mix well. Add food coloring if you wish. Let it dry about an hour. When ready, it will be smooth and rubber-like. Store in an airtight container.

Bouncy Polymer Chemistry
In this experiment, you will make your own homemade silly putty. By varying the ratio of ingredients and by observing physical properties, you can determine the best recipe for the putty.

Silly Putty for Potholes
“So we were putzing around with different ideas and things we wanted to work with and we were like, what’s a common, everyday problem all around the world that everybody hates?” explains 21-year-old team member Curtis Obert. “And we landed on potholes.” He and four other students decided on a non-Newtonian fluid as a solution because of its unusual physical properties. “When there’s no force being applied to it, it flows like a liquid does and fills in the holes,” says Obert, “but when it gets run over, it acts like a solid.”

Where to get starch

Dear Ann:

Thank you for your interest in our Faultless Starch products. You may purchase our products online at www.agelong.com/ or by calling toll free to 1-800-892-8022. If you provide your address we will forward an Agelong Catalog.

We have a new Faultless Liquid Starch that is available at K-Mart. You may wish to call ahead to speak with the manager. If it is not on the shelf they can order it in for you. This product will work great for many craft projects.

If you advise us of your location, we will advise if any stores in your area carry the Faultless Dry Starch. It is more difficult to locate, but always available online or through Agelong Catalog.

Again, thank you for you interest in our products.

Marcie Bonin
Home Economist
Email: [email protected]

Note: Agelong Catalog changes often. If starch links do not work, go to the home page and look under “Clothes Care.”

Note on where to get Borax

Please visit the 20 Mule Team Laundry website at 20muleteamlaundry.com.

Borax is also available on Amazon.com.

More …

Crime Scene Investigation
Food Chemistry
Gak Recipe
Ice Cream
Showy Demonstrations

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