I've got another recipe - no idea whether it's any good. I can't remember where I found it.
Baking Powder & Cornstarch Craft Dough
(Borrowed from
www.nationalgeographic.com)
2 cups (470 ml) baking soda
1 cup (240 ml) corn starch
1 1/4 cups (300 ml) water
2-quart (1.9l) saucepan
Wax paper
Poster or acrylic paints
Colored felt-tip markers
1. Stir the baking soda, cornstarch, and water together in the saucepan. Heat for a few minutes on a medium setting, stirring constantly until the mixture is the thickness of mashed potatoes.
2. Remove the pan from the heat and scrape the mixture onto a piece of wax paper. You’ve made a kind of clay! Allow it to cool for at least ten minutes.
3. With your hands, roll the cool clay into a ball, then flatten the ball on the wax paper. Keep rolling and flattening the clay until it is smooth.
4. Allow creations to dry overnight or until they are hard. Then add markings and details with paint and colored markers.
5. Keep unused clay from drying out by sealing it inside a plastic bag and putting it in the refrigerator.