You can’t really go wrong with some good slime, but you can make it better! The video above shows a simple method of making thermochromic color-changing slime. Here’s how you do it:
Elmer’s white glue (at least ½ cup)
Warm or hot water
Thermochromic pigment (can be purchased online through sites like Amazon or Etsy for about $5 USD)
Food coloring (optional)
Adult supervision (Adult supervision at all times please)
- Add ½ cup of Elmer’s white glue to a cup or bowl.
- Add ½ cup of warm water to the glue and stir until it is mixed well and the same consistency throughout. *You can add 1 teaspoon of the thermochromic pigment to this mixture now or wait until step 6 (as shown in the video).
- In a separate container, add 1 cup of warm or hot water. Then stir in 1 teaspoon of Borax until the powder is completely dissolved.
- Add small amounts of the Borax solution to the glue and water mixture. Stir these together until it thickens into a slime. You may not need all of the Borax solution, so be sure to add it slowly and in small parts.
- Using your hands, fold and knead the slime 20-30 times until it is the same consistency throughout.
- Add 4-5 drops of food coloring and 1 teaspoon of thermochromic pigment (unless this was added during step 2 above) to the slime. Fold and mix the colors in until the slime is all one color.
- Time to play! Have fun experiencing how the slime changes color with your touch or when it comes into contact with other warm objects, like the outside of a fresh cup of coffee or tea. (Tip: rub your hands together quickly to warm them up if the slime is not reacting to your touch.)
**If you prefer to make slime without the use of Borax, use your favorite slime recipe and add 1 teaspoon of the color-changing pigment for the same effect.
The thermochromic pigment changes color at certain temperatures, so at room temperature it might be yellow, while at body temperature it might be red. The colors depend on the pigment used as there are many varieties out there, so use your favorite!
Take Another Direction
Did you enjoy watching your slime change color with different temperatures? You can also make slime that responds to UV light (sunlight or special lightbulbs). These are called photochromic pigments and you can use the same steps above to make light-reactive color-changing slime. Of course, you will need to substitute the type of pigment used, or add a little of both kinds to really see what kinds of colors your slime could become!