Rainbow Jello

Directions

1. 1
   Mix milk and sugar together; bring to a boil.
2. 2
   Cool.
3. 3
   Dissolve the Knox gelatine in 1/2 cup cold water; add to milk and sugar mixture.
4. 4
   Add sour cream and vanilla and beat until smooth. Divide into three portions.
5. 5
   Mix one package of jello with 1 1/2 cups boiling water (no cold water).
6. 6
   Pour into 9 x 13-inch dish and refrigerate until completely set; add 1/3 of milk mixture and allow to set completely.
7. 7
   Repeat with other colors of jello with milk mixture in between and ending with a layer of jello.
8. 8
   Allow to set completely after each layer.
9. 9
   Cut in squares to serve.