Ursula Kolbe offers the following recipes for art resources (p.130):
Blend three heaped tablespoons of cornflour (cornstarch) to make a thick cream.
Add 1 1/2 cups of boiling water, stirring all the time.
Mixture should form a thick paste. Add more water if necessary.
(It will thicken as it cools.)
Paste Paint (1)
Make paste as above, but add more water until the mixture is clear and suitable to use with a brush.
Add a few grains of food dye and stir with a brush. Test the colour on a piece of paper and add more dye if necessary. Allow to cool.
Food dyes (edible vegetable dyes) yield brilliant colours. You need only buy red, blue and yellow, as these mix to make purple, orange and green. Dyes in powder form are available from art suppliers and good toy stores. You can also use liquid dye from supermarkets, but these colours are weaker in strength.
Paste paint (2)
Blend 12 level tablespoons of cornflour (cornstarch) with one cup of cold water and add sufficient boiling water to the whole to make a litre.
Boil for one minute until clear and thick. Add dye as per recipe 1.
Allow to cool.
In a large saucepan mix 1/2 cup cornflour (cornstarch) with 1/2 cup of cold water.
Add 1 cup boiling water.
Bring to boil on the stove.
Remove from heat when thick and clear. Add a few grains or drops of food dye or a teaspoon of non-toxic powder paint.
Stir well. Allow to cool.
2 cups plain flour
1/2 to 1 cup of cooking salt
1 cup of cream of tartar
2 tablespoons cooking oil
2 cups boiling water
A few grains powdered food dye or drops of liquid food dye.
Mix dry ingredients, then add oil. Add dye to water and mix slowly with dry ingredients. Knead the mixture as it cools. If it is very sticky add a bit more flour and cream of tartar, but be careful not to add too much. (The mixture loses stickiness as it cools.) If stored in an airtight container, the dough will keep a week.
Ref: Ursula Kolbe (2007) Rapunzel’s Supermarket: All about young children and their art. Second Edn. Pippinot Press: Byron Bay, NSW.