1-First Step: Prepare the Bottom Layer Begin with the purple layer by dissolving one 3-ounce package of grape flavored gelatin along with 1 teaspoon (half of a 1-ounce package) of unflavored gelatin in 1 cup of boiling water. Stir until everything is completely dissolved, then pour it into your 9 by 13-inch pan. Place the pan in the refrigerator on a flat surface and let it chill until set, which takes about 30 minutes.

2-Second Step: Make the White Layer While the first layer sets, prepare the white layer by stirring 2 teaspoons (one full 1-ounce package) of unflavored gelatin into 1 cup of boiling water until fully dissolved. Add half of a 14-ounce can of sweetened condensed milk and stir well to combine. Allow this mixture to cool to room temperature, but don’t let it set yet this usually takes about 10-15 minutes.

3-Third Step: Add the Next Colored Layer Once the purple layer is firm, move on to the next color in the rainbow order, which is Berry Blue. Dissolve another 3-ounce package of flavored gelatin with 1 teaspoon of unflavored gelatin in 1 cup of boiling water, stirring until dissolved. Let this cool slightly before pouring. Then, pour about three-quarters of a cup of the cooled white mixture over the set colored layer, tilting the pan gently to spread it evenly. Refrigerate for about 20 minutes until it sets.

4-Fourth Step: Continue Layering Keep alternating between the colored layers and the white layers, following the rainbow order: after Berry Blue, go to Lime, then Lemon, Orange, and finally the red flavor. For each colored layer, use the same method as the first, preparing it fresh each time and letting it cool before adding. You’ll need to make the white layer multiple times as it sets quickly at room temperature, so prepare just enough for each use. Each layer should chill for 20-30 minutes to ensure they don’t mix.

5-Fifth Step: Finalize and Cut the Cubes After all layers are added and fully set which might take around 4 hours total chilling time it’s time to slice. Use a paring knife to cut the gelatin into one-inch squares for clean edges. Gently lift the cubes from the pan using a small spatula to avoid squishing them. This step ensures your cubes look neat and are easy to serve.