Pour 1 cup of white school glue into a bowl
Add 1 to 2 cups of shaving cream
Mix until fluffy and combined
Add food coloring if desired
Add 1 tablespoon of contact lens solution
Stir until the slime starts to form
Add a little more contact lens solution if needed
Knead the slime with your hands until it is no longer sticky
Store the slime in an airtight container