This particular slime is also called Flubber, Gluep, Glurch, or Gak, and it’s made from glue, water, and the tiniest bit of Borax, a mild powdered laundry soap. (NOTE: Borax is soap and it’s toxic, so please use your best judgment if you choose to use this with young children.)

I wasn’t sure how messy this would get and set the whole project up in our big mixing tub. The best part? The ingredients don’t have to be combined exactly in order to get perfect results!


  • plastic tub or bin
  • glass bowl
  • glue
  • warm water
  • food coloring (optional)
  • Borax


  1. mixing glueSqueeze about 4 ounces of glue into a glass bowl.
  2. Mix in 1 1/2 bottles of warm water. (The recipe calls for 4 ounces of glue and 4 ounces of warm water, but remember: the measurements don't have to be exact and it will still work.)
  3. Add your food coloring, if desired. We added red food coloring and mixed it into a lovely shade of pink.
  4. mixingMix 1 teaspoon of Borax into 1/2 cup of water, and slowly add the solution to the glue mixture.
  5. Stir in the Borax solution until the slime started to come together. We did not use all of the Borax solution.
  6. Knead the Flubber. At first it will be really wet and gooey, then stringy and sloppy, until finally it will hold together.
  7. We stickykept kneading until we had one easy-to-work-with mass of slime that could be pulled apart and manipulated—to some extent, because really, this slime has a mind of its own. My daughter requested a muffin tray with the idea that it would make nice little cakes. It is so viscous and pliable it is! Completely different from play dough, and absolutely inspiring to little Miss Curious. She tried cookie cutters to no avail, but scissors were so much fun and completely rewarding with this medium.

    When you're done using your Gak, you can store it in a sealable container or scissorsZiploc bag for about two weeks (when it may start to smell!).

    To learn more about the benefits of sensory play, visit Sensory Play and Early Child Development.

Rachelle Doorley is an artist and mother of two. She publishes the popular children's creativity blog, She holds a master’s degree in arts education from the Harvard Graduate School of Education and lectures on visual literacy at Stanford and the San Jose Museum of Art.

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  • Plantastic

    Another fun idea is to grow a PET TickleMe Plant and watch how the leaves fold and the branches fall down when you Tickle It!!

  • Amber

    These are poor instructions. Making ours based on these did not make the correct final product. The glue and water should be well combined before adding the borax/water.

    • Jessica

      We used these instructions and ours turned out perfectly! It says “mix” which means to combine to form one substance or mass. Thank you to the author for helping us find a fun activity on a snowy day!

  • mmmooommmooommm

    cool now i can make it

  • kalie

    What is the borax for?

    • Eric

      The borax provides the reaction with the glue to make linked polymer chains (aka slime). For example, let’s say the glue is a bucket of chains and a handful of magnets is the borax powder. If you were to pour the chains out of the bucket, it would resemble glue pouring out of a bottle. However, when you add the magnets (borax) to the bucket of chains what will happen?? When you go to pour it out, instead of a stream of chains pouring out, you’d get a clump of chains. I hope that made sense, haha

  • carter

    do I have to use borax

    • Eric

      You do. Borax contains a naturally occurring material: sodium tetraborate. This mineral interacts with the glue to turn it into a solid. You can experiment with other types of powdered laundry detergents to see if the results come out different.

    • Layley

      You can use other recipes such as Tide and glue (and shaving cream if you want fluffy slime) to make slime. You can use glue and eye contact solution too. There are many recipes out there, not just Borax.

  • steeley

    how much borax?

  • ofamily

    This is fun to make and fun to use! The amounts of the ingredients we used are 1/2 cup of glue,6 tablespoons of cold water, 1/4 cup of hot water(not boiling hot),and 1/2 teaspoon of Borax. You mix the glue and COLD water in one bowl and the borax and HOT water in a different bowl.You can put any color food dye into the glue mixture.Then you add the two mixtures together and TA-DA! You have a fun, new way to make the same thing as Gak but maybe a little easier!

  • PreKteacher

    Borax is not toxic… it comes from Boron which is an element on the periodic table. It is completely harmless and is often used as a detergent for washing babies clothing because of it’s purity. As with any substance not meant as a food product, care should be taken to ensure children do not consume it, but accidental hand to eye, or hand to mouth contact with Borax is not toxic. Luckily it tastes terrible so if a child accidentally tastes it they will stop immediately and want their mouth washed.

  • Prrrr

    We followed the instructions precisely and ended up with a very watery end product. Result was about one cup of water and one teaspoon of actual gak. I’ve made this using other recipes in the past and it turned out great; expected better from pbskids!!

  • Tamara

    Hi – I thought I’d add to the discussion. I have 2 kids who both tried this recipe. My son’s worked great and my daughter’s ended up with tons of water. We tried my daughter’s again and found that timing is everything. My son and my daughter’s second try they continuously stirred everything. My daughter’s first try she paused a few times before stirring (waiting for the spoon, etc). You must continuously stir at the beginning to make it work properly.