25 Days of STEAM: Glow In The Dark Slime

25 Days of STEAM: Day Seventeen


Glow In The Dark Slime


This hands-on science activity is pretty messy. We recommend it for children 7 and up!



As with all science experiments, safety is extremely important! We recommend wearing safety goggles and old clothing for this experiment. Parent supervision is required.



Supplies You’ll Need:


  • Glow In The Dark Paint (White or Green)Glue bottle, isolated, includes clipping path
  • Borax


  • Elmer’s Glue (5 oz)


  • Water


  • Two Small Bowls


  • One Large Bowl


  • Two Spoons


  • Measuring Cup


  • Measuring Spoon


  • Plastic Tablecloth (trust us)


  • Safety Goggles


Note: Feel free to add food coloring in the first step. If you’re very brave, you may even use glitter. Just note, “added colorful materials” will lesson the glow effect of the slime.






  • In one bowl, pour in 1/2 cup of water and 1/2 tsp of borax powder. Use a spoon to mix the ingredients together until the borax has been dissolved.


  • Add the entire bottle of glow in the dark paint to the bowl.


  • In the second bowl, pour in the bottle of Elmer’s glue and add 1/2 cup of water. Use a spoon to mix the ingredients together.


  • In the next step, pour the contents from the first bowl (borax & water) and the contents from the second bowl (glue and water) into the large bowl. Mix these ingredients together.


  • When the contents in the large bowl start to solidify into slime, use your hands to knead the slime. Once there is only a little bit of liquid left, you may remove the slime from the bowl and place it on the table.


  • To recharge the glow in the dark effect of your slime, place it under a light bulb.



What is happening?


BlobThe glow in the dark slime you just created is something called a polymer and is held together through cohesion. This special substance acts like a liquid and a solid. If you were to take your slime and put it into a tall glass, it would take the shape of the glass just like a liquid would (think of it like pouring milk into a glass). If you were to pick the slime up, it is thick enough as a solid that it wouldn’t slip through your fingers like a liquid.



Polymers are made up of chains of molecules.  In a liquid the molecules are spread out. In a solid the molecules are held tightly together in chains. The tight chains of molecules help to hold molecules of the glow in the dark paint together. Again, if your slime begins to lose its glow in the dark quality, place it under a light for a period of time to “recharge” it.



 Science Vocabulary:


  • Polymer – (n.)  is a chemical compound formed from long chains of the same molecule group. These chains repeat over and over.


  • Cohesion – (n.) the force that holds molecules of the same substance together


  • Liquid – (n.) a state of matter that conforms to the shape of a container in which it is held.


  • Solid – (n.) a state of matter that is firm and stable in shape.


  • Molecule – (n.) a group of atoms bonded together.


  • Adhesion – (n.) the force that binds molecules together.