From multi-hobbies dot com
Here is the basic recipe:
one cup of fine salt
one cup of flour
about half a cup of water
Mix the flour and the salt together in a large bowl. Depending on the flour brand, you may need a different amount of water so it is best to make a well in the center and pour in the water. You have to knead until smooth and elastic and non-sticky dough.
Shape the dough into a ball and wrap it into a plastic film in order to prevent it from drying. The dough is now ready to be used.
Variations :
The basic recipe can be adapted for different purposes :
Add more flour and you'll get a softer dough
Add more salt and the aspect of the sculptures will be granulous
Add wallpaper glue and the dough will be more cohesive
A few way to add color to your sculptures :
by using different brands of flour (rye, ...)
by adding spices, chocolate powder, coffee...
by adding gouache, oil paint (use gloves and knead long enough to get a uniform color)
by adding food colorants
by leaving the sculptures in the oven until golden
you can also paint your sculptures once they have dried
Air drying is alright for small and thin objects. Let the objects dry a week on a grill before painting or varnishing.
Cooking
Several methods exist depending on the oven, and on the time allowed to check the object.
If the object air dried a little, start cooking at 50°C. After about 30 minutes, you can gently increase up to 100°C. Then you have to estimate the cooking time, the thicker the object, the longer it needs to dry!
For each centimeter, count roughly 2 hours at 100°C. It obviously also depends on your oven. So check out from time to time your object, it should sound hollow if it is well cooked!
For those who want to brown the objects, increase the temperature at the end up to 170-200°C and check very often.
The best thing to do is to cook the object at once (thus at a constant temperature) in order to prevent cracks due to the cold/hot variation.
If you have prepared the object on aluminum, remove it at the middle of the cooking so as to put the object directly on the grill. This way both sides of the objects can dry.