How To Make Flubber

Stir 1/8 cup borax into 500 ml warm water. It's okay if some borax remains undissolved. Allow solution to cool to room temperature.
In a separate plastic cup, stir 2 spoonfuls of glue into 3 spoonfuls of water. White glue will give you opaque snot glue gel will produce you translucent slimy snot.

Stir a couple of drops of food coloring into the glue mixture.
Add a spoonful of the borax solution to the glue mixture. Stir (if in a plastic cup) or squish (if in a baggie).
Have fun with your snot!