thermochromic slime

Learn how heat changes molecular structure with this awesome experiment.

Learn how heat changes molecular structure with this awesome experiment.

This STEM experiment gets its color changing super powers from thermochromic pigment. After absorbing a certain amount of light or heat, the crystalloid or molecular structure of the thermochromic pigments reversibly change in such a way that it absorbs and emits light at a different wavelength than at lower temperatures – thus creating new colors.

Thermochromic Slime

Ingredients:

  • 1/4 cup white school glue
  • 1 tbs. water
  • 3 teaspoons thermochromic pigment
  • 1/4 cup liquid starch
  • Food coloring

Directions:

  • In a bowl, mix together the school glue and water.
  • Add food coloring of your choice and stir until color is incorporated.
  • Slowly add the thermochromic pigment and stir until well combined.
  • Add the liquid starch and mix until thick and slimy. Then knead the slime with your hands. If the mixture is too sticky, add more liquid starch.
  • Time to play! Watch how the color changes with the heat of your hands or the cold temps of a frozen water bottle.
  • Store slime in a sealed container for up to one week.