Slime requires an "activating" ingredient to transform it from a gluey, goopy mixture to a malleable solid. In lieu of a laundry booster, the secret activator in this slime recipe is saline solution, which can be found at your local pharmacy.
We used this solution to make Slime Valentines for kids. Fluffy slime will last 1 to 2 days in a sealed air-tight container. To reactivate it once dried, run slime under warm water.
Measure 1 cup of white glue, 1 cup of shaving cream, 1 teaspoon of baking soda, 2 teaspoons of saline solution, and food coloring in separate bowls; set aside.
Empty glue into large mixing bowl. Add baking soda and mix with a spatula until well combined.
Add shaving cream to mixture and combine until consistency is thick and fluffy.
Add drops of food coloring, stirring to blend, until desired color is achieved.
Add saline solution, mixing to combine. (This removes the stickiness from slime.)
Knead with your hands until slime mixture becomes dense and formed, adding saline solution until desired texture is achieved.