"Maureen, What is this called?" was the question I heard the most often today.
And it revolved around this...
It's an easy recipe of 1/2 Tbsp borax diluted in 1/2 cup of water.
Then mix 1/4 cup of white glue with a 1/4 cup of water in a separate container.
In a ziplock bag mix it all together (you can add food colouring at this time).
Add 1/2 cup of cornstarch to the bag and continue to mix.
Dump contents on to table and continue to knead.
WARNING: it will be wet at first but the more you play with it the less sticky it will become.