For a small ball of playdough, mix 200ml of plain flour with 10ml cream of tartar and 100ml salt. Pour this mixture into 200ml of warm water. Add 1 to 2 tablespoons of vegetable oil along with any colours or scents you'd like to use. Place in a non-stick pan over a low heat and stir until you reach a playdough consistency. When the dough has cooled, knead until smooth.