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Glowing DIY moon rock ball with crater texture glowing blue in a dark room surrounded by candles and stones

DIY Glowing Moon Rocks

Soft, moldable, bouncy moon rocks that glow in the dark—part slime, part dough, and 100% outer-space fun! Perfect for STEM play, rainy days, or themed parties.
Print Recipe Pin Recipe
Prep Time 10 minutes
Total Time 10 minutes
Servings: 1 batch
Ingredients Method Notes

Ingredients
  

  • ½ cup white school glue like Elmer’s
  • ¼ cup warm water
  • 1 tablespoon cornstarch for texture
  • ½ teaspoon baking soda
  • 1 tablespoon glow-in-the-dark paint or phosphorescent powder
  • ¼ cup liquid starch found in the laundry aisle
  • black or gray food coloring optional, for moon-like color
  • glitter optional
  • mixing bowl and spoon for combining ingredients

Method
 

  1. In a mixing bowl, stir together the white glue and warm water until smooth. This forms your moon rock base.
  2. Stir in the baking soda, glow-in-the-dark paint or powder, and a few drops of food coloring if using. The mixture should begin to look gooey and alien-like.
  3. Add the cornstarch and stir again. The texture will start to thicken, turning more dough-like.
  4. Slowly pour in the liquid starch while stirring. The mixture will begin pulling away from the sides of the bowl, forming a sticky blob.
  5. Use your hands to knead the mixture for 1–2 minutes. If too sticky, add more cornstarch. If too stiff, add a splash of warm water.
  6. Form the dough into lumpy, uneven shapes to resemble moon rocks. Avoid perfect spheres for a more realistic look.
  7. Place the rocks under a light or in sunlight for 1–2 minutes to charge. Then turn off the lights and watch them glow!

Notes

Store your glowing moon rocks in an airtight container to keep them soft. Avoid overexposure to air, which can dry them out. Recharge them under any bright light source when the glow fades. Add glitter for extra galactic flair.