1 cup white glue
1-1/2 cup liquid starch
food coloring (optional)
sodium benzoate (opt., retards mold)

Directions:

Mix glue and coloring in plastic container. Add starch a little at a time, stirring constantly. Keep stirring until mixture holds together like putty. Cover and let stand for 3-4 hours. Pour off extra starch.  Store in a sealed container or a plastic egg.