That's the sound of children playing.
Now listen to the words and wait.
Time for a 1/2 hour mix and make.
You will need
Household Borax powder (sold in the eco section of big supermarkets)
green food colouring
one jam jar and lid per child
Step 1: Mix up a borax solution
Take one cup, add some warm water and one tablespoon of borax. Stir.
Let it sit whilst you measure out the rest of the stuff so that any excess settles to the bottom.
Do be careful, Borax whilst in powder form is a little toxic so avoid breathing in the dust. Once it’s in water though, it’s about as toxic as salt… which is more toxic than you might think, ask slugs.