You will need:
1/2 cup boiling water
2 tbsp. cornstarch
6 tbsp. cold water
1) Dissolve cornstarch in cold water in a cup.
2) Add mixture to boiling water.
3) Stir constantly.
4) Heat mixture until it becomes glossy.
5) Add food coloring.
5) Cool completely before using.
that sounds great, I will have to try it. and you know what is in it so you don't have to freak out when the kid licks his fingers.