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 paste. Boil water and salt. Add to cornstarch mix and cook until clear. Cool overnight, then add 6 to 8 cups of flour and knead until you have the right consistency. Keep a metal salt shaker full of flour handy for the children to keep their clay from sticking.