First, a word of warning, this is an OUTDOOR activity. As it contains food colouring it may stain fabric and skin.
Phew! Now that's over, let's get messy!
Time: 10 minutes plus overnight
Age: Any Age
Line two containers with cling wrap to make removal easier.
In a jug, make up gelatine mixture stronger than specified in the packet instructions. For example, the brand I use asks for 1 and 1/2 - 2 tsp of powder for every 500ml of water. In this case I used 3 tsp of powder for 500ml of water. Add food colouring. Mix to combine
Pour the gelatine into one of the containers. Repeat the process with a different colour and fill the remaining container.
Place the containers in the fridge until set. Once set, remove the jelly from the container, cut into squares and put back into the containers.
Take the jelly outside and begin squishing, squashing, wibble - wobbling and, of course, stomping.