4 env. Knox unflavored gelatin
3 (3 oz.) pkg. Jello flavored gelatin
4 c. boiling water

In a large bowl, combine Knox and Jello. Add boiling water and stir until dissolved. Pour into pan, 15 1/2 x 10 1/2 x 1 inch. Chill until firm. Cut as desired. May keep out as they won't melt. Great for kids.