Add the flour, salt and cream of tartar to a large mixing bowl.  Whisk to combine.

Add the oil and water to a saucepan over medium heat.  Slowly whisk in the flour mixture. Stir constantly until a stiff ball of dough forms. Remove from heat and allow the dough to cool for 5 minutes.

If you want to color the play dough, divide into equal parts and press out with your hand to create a thick pancake shape.

Add 3-4 drops of your choice of food coloring to each pile of dough. Fold the dough over to cover the drops and place in a plastic bag and seal.

Knead the bag with your hands for about 3 minutes or until the food coloring is evenly distributed throughout the play dough.