How to make a rainbow cake (video)

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This is a super fun cake that everyone is sure to love. Piping on a cake can be tricky, but with this cool design, you can't go wrong! It's like little puffs of frosting that look so good, you won't be able to wait to cut into this cake and grab yourself a slice.
The cake has six light and fluffy cake layers, filled with delicious buttercream frosting. Each layer is very thin, giving it a delicate texture, but with a real burst of color! Make this cake for your friends and family, and watch them be blown away when you cut the first slice.
Rainbow cake
Cooktop Cove
7 1/2 cups cake batter, divided into six parts and colored red, orange, yellow, green, blue and purple using gel food colors
4 pounds, 15 ounces buttercream, colored as follows:
- 1 pound, 10 ounces plain
- 8.8 ounces red
- 8.8 ounces orange
- 8.8 ounces yellow
- 8.8 ounces green
- 8.8 ounces blue
- 8.8 ounces purple
6 cake pans, 9-inch
Spray oil or butter for coating the cake pans
Parchment paper
6 piping bags, 12-inch
1A piping tips
10-inch round cake board
1. Spray cake pans with nonstick spray or rub with butter, and then line using parchment paper.
2. Divide 7 1/2 cups cake batter into six small bowls. Add gel food colors and stir. Pour into cake pans and bake each cake at 340 degrees Fahrenheit for 18 to 20 minutes, or until a toothpick comes out clean.
3. Allow to cool in their pans for 10 minutes before turning out onto a wire rack. Allow to cool completely. Wrap in plastic wrap; chill one hour.
4. Stack the cake and apply plain buttercream to each layer, starting with purple on the bottom, then blue, green, yellow and red. Apply a crumb coat of buttercream to the sides and top of the cake. Chill in the fridge for 15 minutes.
5. Fill a piping bag with purple buttercream and apply dollops to the cake with a 1A tip, dragging as you go. Once you have gone all the way around the cake, pipe the blue buttercream in the same way. Continue up the cake in the same order of colors as the layers until the sides are done with all six colors.
6. Starting again with purple, repeat the process on the top of the cake, working your way into the center, and ending with the red buttercream.
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