How to Make Monster Slime


Science Experiments, STREAM Activities / Saturday, October 6th, 2018

My kids are REALLY into slime.  Once we figured out how to make monster slime (you know, with Halloween coming up....or really anytime with these two hooligans), we found an activity that they could do for hours.

This monster slime is made with white glue, poster paint (food colouring works too), baking soda, and saline solution.  Add in some googly eyes and you have monster slime!

Each kid got to pick which colour his monster slime would be.

Monster Slime Recipe

This monster slime recipe is super simple and it is borax-free.  You do, however, need a saline solution that contains boric acid.  That is what turns sticky goop into slime.

  • about 1/2 cup PVA glue (i.e. white glue)
  • 1/2 tsp baking soda
  • green poster paint (finger paint) or food colouring - or any other colour that you want to make your monster slime
  • 1/2 - 1 tbsp saline solution (i.e. contact lens solution) - it must contain boric acid or sodium borate
  • googly eyes
ingredients for monster slime recipe

How to Make Monster Slime

It's really easy to make monster slime.  My kids did this in about 5 minutes, and then played with it for close to an hour afterwards.

  • Mix your glue and baking soda together.
  • Add some finger paint (about a tablespoon or so).
  • Mix in the saline solution.  This is what turns your gluey mess into slime.  You'll know when the slime is coming together when it turns stringy.
  • Add the googly eyes last.

Monster slime tip: the more saline you add, the more solid your slime will become.  With 1/2 tbsp of saline solution, the slime is super sticky and goopy.  With about 1 tbsp, it is stretchy and slimy but won't stick to your hands.

E with monster slime

How to Turn Monster Slime into Bubble Slime

One thing that we love about this monster slime recipe is that if you stick a straw into your monster slime and blow, you can create giant bubbles!

This kept my kids occupied for a LONG time.  Just stick a straw into your slime, hold the slime around the base of the straw to prevent air from escaping, and blow!  Slime bubbles.

Rebecca is a mother of twin boys and a professional blogger.  She loves to bake, knit, and run through the forest.

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4 Replies to “How to Make Monster Slime”

  1. Okay, I officially love this idea! First, we never have borax in the house (who does?) and second, I don’t like my kids mashing around in it anyway. This slime recipe is perfect and I could even let my nieces and nephew play with it. The googly eye idea is awesome, too! I can see that being a hit at a Halloween party, or changing it up for another holiday . . . trees and star sequins for Christmas, heart beads for Valentine’s Day. Thanks for sharing.

  2. What a fun to keep children happy. I will certainly be keeping this recipe as I have a five year old grandson who would absolutely love this. He would think Granny is super cool coming along with all the ingredients to have a play date with him.

    One of the things I really liked about this is that there is nothing dangerous about the making of the slime. Can’t wait to share this. See even Grannies can have fun.

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