How to make slime with boric acid


How cool is slime. We love slime!

As a kid, Ghostbusters was huge. We had it all over our arms and did the whole “He slimed me”.

Fake snotty sneezes were a thing. We’d sneeze blocks of snot on to our hands and gross each other out.

Parents thought it was disgusting too, which further added to it appeal.

The kids who had slime to play with were the coolest. That was how it was back then, and still how it is today.

With this recipe you can make slime with boric acid.

Total Time

15 minutes


  • Boric acid powder
  • PVA glue from K Mart. Get a couple of bottles so you can have another go. One thing to note with the smaller jars, if they’re not capped properly they dry out. Or buy the larger one as they usually have a screw lid.
  • Water
  • Food colouring, glitter, or anything else you want to add to glitz it up. We’ve used blue food dye in the photo.


  • 2 non-porous bowls (stainless steel works best).
  • 1 teaspoon
  • 1 tablespoon
  • 1 or 2 solid containers with air tight snap lock lids.


  1. In bowl 1, add 1 cup of hot (not boiling) water.
  2. Add 1/4 teaspoon of boric acid into bowl 1 and mix until dissolved.
  3. In bowl 2, add 1/2 cup of PVA glue and 1/2 cup of water. Stir until fully mixed.
  4. Add food colouring, glitter or anything else you want to bowl 2 until you’re happy.
  5. Now get ready to stir. Use the tablespoon to add a scoop of boric acid solution from bowl 1 to bowl 2. Don’t pour it all in at once, otherwise the slime could become too stiff.
  6. Keep stirring. It will take a few minutes for the compounds (polymers) to properly form.
  7. Once the large blob of slime has formed, you’re done! Any excess water can be discarded.

Slime Safety & Precautions

Note: Making slime is a science experiment and safety precautions should still be made when creating slime. By making this slime, you agree to our site terms which you can read here.

  • Adults should handle any chemicals or products.
  • Adults should make the slime.
  • Always read and follow the labels of products used. If any product is accidentally ingested, seek medical attention immediately.
  • This project is not suitable for children under 4.
  • Slime should not be placed in the mouth. Always wash hands before and after playing with the slime.
  • If you notice any skin irritation, discontinue use immediately. If you have sensitive skin, wear gloves while making and playing with the slime.
  • Slime is a science experiment and should be made and played with in moderation. Do not allow children to make their own slime and do not play with slime for an extended period of time.

When you’re done

When you’re ready to pack it all away it can be stored in the containers.

If you do make a mess that’s difficult to clean up, the slime can be dissolved by vinegar.

If you want to dispose of the slime, scoop it into a plastic snap-lock bag, close it up and put it in the bin. You don’t want to pour it down the sink because it is glue based and that’s not good for pipes.

I hope you have fun making your slime. I’d love to know how you get along and you can do that by leaving a comment below.

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