This is the first time I made play dough. It is very simple. All you need is :
1 cup of flour
1/2 cup of salt
1 cup of water
1 teaspoon of vegetable oil
1 teaspoon cream of tartar
Few drops of food coloring
Just mix all these ingredients together in a cooking pot and set over a medium heat while stirring constantly until the mixture becomes a ball. This should only take a few minutes.
Then remove from the stove and place the ball on the counter and add the food coloring then begin kneading the ball. (Be careful, the ball will be warm from the stove).
Knead for 1 to 2 minutes, then let it cool.
You'll want to wear gloves or your hands will turn the color of the coloring.
I keep in a zipper bag. It can keep up to few weeks.