I've been making this recipe for almost 12years in long day care
Uncooked Playdough
4 cups plain flour
1 cup salt
4 tbspoons cream of tartare
6 tblspoons of oil
food colouring
3 cups of boiling water
add dry ingredients then mix through oil/colouring and boiling water
knead on floured surface till smooth.
keep in a plastic bag or container (it goes crumbly if kept in the fridge for too long though)