All you need is
- Food colouring
- brushes or foam
You just combine the water, cornflour and food colouring in containers.
The boys loved it, they like to paint inside, but they had free rein outside and just experimented with mixing colours and making shapes.
It started to rain on us, which cut things short, but I have promised a repeat performance as soon as it is dry and we have time.
As you can see from the photo is dries a lot lighter