The cooked recipe lasts longer i have written a article on this if you wont to look at it

Play dough recipe courtesy of http://www.grandpapencil.com/activity/playdo.htm

Ingredients

100g plain flour

50g salt

150g water

1 t sp cooking oil

1 t sp cream of tartar

Food colouring

Directions

Add 1 - 2 teaspoons of Food Colour to the water and stir well. Mix Flour, Salt, Cream of Tartar and Cooking Oil in a saucepan. Slowly add the Coloured Water to the other ingredients in the saucepan mixing well as you add. Cook on low to medium heat, stirring until the dough becomes thick and comes away from the side of the saucepan

Scrape the mixture onto a cutting board or other smooth, flat surface. Soak the saucepan immediately. Leave the Play Dough to cool for at least 15 minutes to be sure that it is cool inside. You can make some other colours as you wait. Knead the Play Dough until it becomes smooth and workable.

When you have finished playing with your Play Dough wrap it in Cling Wrap and store it in an air tight container in the refrigerator

safe for little people who may sample it. Alternatively use food colouring

1 cup flour
1/2 cup salt
1 cup water
2 T oil
2 T cream of tartar
beetroot or carrot juice

Mix flour, salt and oil, and slowly add the water. Cook over medium heat, stirring until dough becomes stiff. Turn out onto wax paper and let cool. Knead the dough with your hands until of proper consistency. Use as is, or divide into balls and add a few drops of the vegetable juices to make pink and orange.

This is off the back of my cream of tartar packet:

Ingredients:

2 cups flour
4 tablespoons cream of tartar
2 tablespoons cooking oil
1 cup salt
food colouring
2 cups of water

Mix the above ingredients in a saucepan, and stir over medium heat for 3-5 minutes, until the mixture congeals