Rainbow Jello Recipe & Instructions

Here is what you need:

6 small packages (3 ounces) of different jello colors (I used rainbow colors however you can use as many or as few colors as you’d like)
4 packages Knox unflavored gelatin
1 (14 ounce) can sweetened condensed milk

You will make this in a glass 9×13 pan. I did not spray mine with cooking spray and it came out beautifully.
First layer: Mix 1 package of any flavor jello with 1 tsp Knox gelatin and 1 cup boiling water. Cool and pour into pan; refrigerate until set. It takes about 30 minutes to set up in the fridge before you can move on to the next layer. *Important* While waiting for your Jello to set, make the next layer and leave it to cool on the countertop.
Second layer: Mix 1 envelope Knox gelatin with 1/2 cup hot water until dissolved. Add 1/2 can condensed milk and an additional 1/2 cup hot water. Once cooled pour 3/4 cup (just enough to cover the Jello and make a thin layer) of the milk mixture over the set jello and refrigerate until firm. It takes 30 minutes for this layer to set up in the fridge. As soon as you put the white layer in the fridge to chill make the next color jello so that it will have 30 minutes to cool on the counter.
Repeat first and second layer directions ending with a color jello layer. Half way through the process you will need to make the other half of your white mixture. The first time I made this I made the white layer all in one batch and ended up with a bowl of jelled white mix before I was done because it takes so long for the layers to set. Once you run out of white mixture then Mix 1 envelope Knox gelatin with 1/2 cup hot water until dissolved. Add the other 1/2 can condensed milk and an additional 1/2 cup hot water. Once cooled pour 3/4 cup (just enough to cover the Jello and make a thin layer) of the milk mixture over the set jello and refrigerate until firm. Continue repeating layers until you are done.
Once finished, cover with plastic wrap and refrigerate overnight to set good. Then just slice into rectangles and serve! It was delicious too!
I began my layers with purple then blue, green, yellow, orange, and red so they would be in correct rainbow order. Remember Roy G. Biv! Red, Orange, Yellow, Green, Blue, Indigo, Violet. We skipped indigo In order for them to be red on top, purple on bottom, we started with purple and worked backwards. Of course you’ll also have a layer of white in between each.

other models:

source: musthavemom.com