2 disposable, plastic cups
2 Tablespoons hot water (from the tap)
½ teaspoon Borax
1 Tablespoon white glue
1 Tablespoon cornstarch
Food coloring (optional)
Pour the water and Borax into the first cup, and stir until dissolved.
Pour glue, cornstarch and food coloring into the second cup and mix. (You can try adding a FEW sprinkles of glitter into this mixture.)
Add the mixture from the first cup into the second cup. Let the ingredients sit for 15 seconds, then stir.
Once the mixture becomes hard to stir, scoop it out of the cup and roll into a ball.
Enjoy — or make another for a friend!