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Edible flubber

You will need:

  • 1 cup cold water
  • Food colouring (optional)
  • 1 teaspoon psyllium husk powder
  • A microwave-proof bowl
  • Adult help is a must!

A bag of psyllium husk powder, a glass of water and a small glass bowl filled with brown goop

Instructions
 

  1. Pour the water and food colouring into the bowl and mix.
     
  2. Add the psyllium husk powder and whisk until combined.
     
  3. Microwave on high for 5-9 minutes, the longer the heating process, the more rubbery the flubber gets. After the initial 2 minutes the goo tends to rise and overflow, stop the microwave each time it starts to do that and restart after a few seconds.

    Yellow flubber overflowing out of bowl sitting on a glass microwave platter on brown background
     
  4. Remove bowl (caution: very hot!) and tip content onto a plate and let cool.
     
  5. Pick up and play!

    Green flubber brown flubber on a white plate
Jacqui holding green slime with chopsticks
Edible flubber made with 3 ingredients!

Be Amazing Book Front Cover; Ben Newsome, teacher & founder of Fizzics Education. Be Amazing -how to teach science the way primary kids love
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How does the flubber form?

Psyllium is a type of seed, and its outer shell or husk is often used as a dietary fiber supplement (Metamucil, for example), or as a food thickener. The psyllium husk contains mucilage, or a gel-forming polysaccharide. This stuff is hydrophilic, which means it loves binding to water and therefore water soluble. When you first combine the water and the psyllium husk powder, you may notice that it gets thicker and thicker. This is the mucilage at work! This flubber is made up of a colloidal suspension of a liquid (water) dispersed in a solid (psyllium husk particles). We then use heat to speed up the rate of dispersion by blasting the mixture in a microwave. If it overflows, don't worry! It's very easy to peel off and stuffed back into the bowl again, just use cutlery since it's super hot! The resulting slime, once cooled, is cold and clammy to the touch, but comes off relatively clean. It does not self-heal, so after it has broken or been cut, it is difficult to stick the pieces back together again. 

Note: While this slime is edible, mass consumption is not recommended. Check the label on your psyllium husk powder to find serving suggestions.

For more slime recipes, check out our comprehensive guide to SLIME!

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