4 pkg. gelatin (1 ea. lemon, lime, orange and strawberry)
4 c. boiling water
2 c. cold water
2 c. milk
2 env. Knox unflavored gelatin
1/2 c. boiling water
1 c. sugar
1 pt. sour cream or plain yogurt
2 tsp. vanilla

To each flavor of gelatin add 1 cup boiling water to dissolve then add 1/2 cup cold water to each flavor. Pour lime gelatin into 9 by 13 by 2 inch baking pan and place in refrigerator to set. Leave other 3 flavors at room temperature. Prepare White Sauce by heating milk. Set hot milk aside in large bowl. Dissolve Knox gelatin in 1/2 cup boiling water and add to hot milk. Mix sugar with sour cream and vanilla. Add to hot mixture. Blend well. When lime gelatin is set, use 1 1/2 cup White Sauce for second layer. Refrigerate until set. Add lemon gelatin and refrigerate until set. Continue until all gelatin is used, alternating gelatin and White Sauce. Strawberry gelatin is last. Let chill until very firm. Then cut and serve your rainbow.