After seeing a friend of mine make a kick ass rainbow cake, I had to try making one too! I didn't want to use too much food coloring because I'm unsure what it chemically contains, so it turned out to be more of a pastel rainbow cake, which is equally fun. Because I used a baking pan that's meant for things like banana bread, you can see how the heat rose and cycled through the batter by noticing how the colors warped. Pretty neat!

If you want to make your own, I just bought a simple Betty Crocker Vanilla cake mix and a mini pack of food coloring. Mix the batter, divide into your colors, pour your colors one by one to create individual layers and bake! If you want more distinct layers, I'm guessing you should bake it in a traditional oven for even heat distribution. I baked mine in a toaster oven to conserve energy, which might be why the warping from the heat is more extreme.

To avoid your hands from getting splattered with food coloring, try opening the bottle caps while the bottle is wrapped in a paper towel. I find the cap splatters each time I snap it open and closed. I learned this tip while making colorful homemade playdough as a kid ;o)