Basically you mix cornflour, water and food colouring and give it a stir and it's ready to use. Easy Peasy :-)
I used one of my silicon muffin tins to make up 6 colours - red, orange, yellow, green, blue and purple. I made smaller amounts than the recipe suggested as I didn't want to make heaps if baby wouldn't be interested. I also dug out my old pastry brush as it had a chunkier handle and would make larger strokes than any of the paint brushes I have in my craft room.
We headed out to the steps leading up to our front door (which some may say is a silly choice but it was in the shade and away from the dog so the best place at the time!) and got started. Baby loves going out the front door and rummaging so was out like a shot. I started swirling the brush round in the colours and brushing it onto the steps which promptly got his attention and he had a go...
I did start off with a separate pot of water to rinse the brush but it got knocked over so in the end the colours started merging together!
I thought I'd made the colours too dull to begin with but once they started drying they really brightened up (brighter than they look in this photo).
The next day we rinsed it off with a watering can full of water and most of it came away. There was some left but we've had rain which has now rinsed most of the colour off. My flower on the top step is still there as a lovely reminder though :-)
It was lots of fun and a great activity for a warm day :-)