1/2 c. flour
1/2 c. cornstarch
1 c. salt dissolved in 3 3/4 c. boiling water

Blend flour and cornstarch with enough water to make a paste. Boil salt and water. Add to cornstarch mixture. Cook until clear. Cool overnight and add 6-8 cups of flour. Knead until right consistency. Keep extra flour available for children to keep clay from sticking.