The process is quite simple and the effect is very special. Don't limit yourself to just rainbow colors either. For a princess party, use pink, purple and white. For the 4th of July use white, red, and blue. The possibilities are endless.
1 white or yellow cake mix, prepared according to box instructions
food color, I used Betty Crocker gel colors
2- 8 inch cake pans
Preheat oven to 350 degrees. Prepare cake mix according to package instructions. Next divide the batter into six even amounts. My cake mix yielded 5 cups so I had approximately six bowls filled with 3/4 c. each. Using gel colors, tint the batter to desired colors.
Next with your greased cake pans, start pouring three of the colors into a pan. This requires a slight bit of thinking. You want to put colors that compliment each other in the same pan. For example, I poured the red, yellow, and orange together. Then the blue, green, and purple. Pour one color at a time directly into the center of the pan. Don't worry about spreading it or making it even, they colors will level themselves out as you pour.
Bake according the package instructions. Allow to cool on a rack for 10 to 15 minutes. Then remove from pan an allow to cool to room temperature on a baking rack.
Frost and decorate with your favorite frosting and sprinkles.
***If you are doing cupcakes pour approximately one teaspoon of each color into each cupcake well. One teaspoon of all six colors, fills it about 2/3 full. Bake according to cupcake instructions.***