1. In a heavy sauce pan, combine flour, salt, and cream of tartar. Pour the water and oil into the dry mixture and stir well.
2. Cook over medium heat for 3 to 5 minutes, stirring constantly, until dough forms (will pull away from the sides of the pot)
3. Let it cool in a bowl covered with a wet cloth for a minute. Add food coloring (or ready mixed paint) and knead until smooth and blended.
4. Store in an air tight container.