In a large mixing bowl, dissolve the raspberry Jello in the boiling water and stir until thoroughly mixed.
To the bowl, add the thawed raspberries, undrained crushed pineapple, and salt.
Measure 1 ½ cups of the Jello salad mixture and pour into a 6-cup Tupperware ring mold. Chill in the refrigerator until firm. Time may vary (about 20 minutes)...be patient. Make sure this layer is completely firm before proceeding.
Allow the remaining bowl of Jello salad mixture to stand at room-temperature.
Once the first layer in the 6-cup ring mold has firmed up in the refrigerator, remove and carefully spread 1 cup of the sour cream evenly over it.
Next spoon half of the remaining room-temperature Jello salad mixture over the sour cream layer. Again chill this second layer in the refrigerator (about 20 more minutes)- be patient again. The second layer must also be firm before proceeding.
Remove from the refrigerator again and carefully spread the second Jello salad layer with the remaining cup of sour cream.
Then pour the remaining room-temperature Jello salad mixture over the 2nd sour cream layer. Cover with a lid and chill overnight in the refrigerator.
Before serving, gently remove the Raspberry-Pineapple Ribbon Jello-Salad from the ring mold and place it on a beautiful serving plate. Don't blink...it might be gone!