Project Description


The Science of Edible Slime

I‘ve made edible slime a few time when my kids were little. It’s messy and sticky but if you’re in the mood for some safe play fun and have little ones that still like to put everything in their mouths, doh,  then this DIY science play is for you.

Key vocabulary to use while playing.

???? Sticky

???? Stretchy

???? Mixture

???? Combine

Here is what you’ll need!

  • Marshmallows
  • Microwave-safe bowl
  • Spoon
  • Vegetable or canola oil
  • Confectioners’ sugar


Put 5 Peeps in a microwave-safe bowl and microwave on high for 30 seconds. Stir in about 1 teaspoon of oil until the mixture is stringy and combined. Slowly stir in confectioners’ sugar until you’ve reached your desired consistency (we used about ¼ to ⅓ cup sugar). Transfer the slime to a work surface lightly dusted with more sugar. Cover your hands with sugar to prevent sticking. Knead gently until the slime is smooth.

The Science:

Marshmello’s are made form sugar, gelatin, corn syrup and water. WOW, thats not much for such a tasty treat. Anyway,  that puffy yummy mush bag has a low boing point which make it melt once it warms up even just a little bit. When you pop that marshmallow in the microwave you are adding heat radiation to the substance and this energy heats the water molecules inside the marshmallow and it breaks its link form the gelatin making it softer.

So now you have a soft liquidy miture and to keep it that way and help it not go back to a hard marshmellow structure you add sugar powder. The sugar will absorbe some of the free flowing water molecules so they dont get cought up in the geletan matrix.  Adding oil helps keeps the stick factor of the sugar go down by adding a slipperness to your mixture. Oil is amazing like that.

More Play Hacks