The girls said it looks like a traffic light
(dont worry I do know the middle should be orange but you cant make bananas from orange playdough!)
1 1/2 c salt
3 tblspn cooking oil
6 tsp cream of tartar
3 c water
Mix together in a large pot. Cook over a moderate heat, stirring frequently until mixture leaves the side of the pot and forms a ball.
Turn out onto a work surface and knead. I then divide it up and knead in the colours. (if you just want one colour add it to the ingredients when you measure them into the pot).
Keeps indefinately if kept in an airtight container.