Confetti Jello

4 (3 oz) boxes Jello in assorted colors/flavors

4 c boiling water

4 envelopes unflavored gelatin

1 1/2 c hot water, divided

1 can (14 oz) sweetened condensed milk

1/2 c water

Dissolve 1 box of Jello in 1 c boiling water. Pour into 8 x 8" pan (or simlar) and chill until firm (2 hours is adequate). Repeat for remaining Jello flavors. In a 2-cup measuring cup, sprinkle unflavored gelatin over 1/2 c hot water. Let sit 5 minutes. Add remaining 1 c hot water and stir until gelatin is dissolved. In a 1-qt measuring cup, stir condensed milk with 1/2 c water. Pour gelatin mixture through a sieve and add to condensed milk mixture. Let sit until cool (room temperature). Cut flavored Jello into small cubes and toss gently in a 9 x 13" pan. Add condensed milk mixture to cubes. Chill until firm. Cut into serving size pieces (we like to cut into 1 3/4" pieces because they fit nicely in serving cups).