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Neon Layer Cake - a multi-layer cake with alternating layers of different UV-reactive colors. When sliced under blacklight, each layer creates a striking glowing pattern.

Neon Layer Cake

This Neon Layer Cake is a vibrant, multi-layered dessert that glows under blacklight! Made with UV-reactive ingredients like tonic water and vitamin B2, each layer alternates in bright neon colors, creating a stunning visual effect when sliced.
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Prep Time 30 minutes
Cook Time 25 minutes
Total Time 55 minutes
Course Dessert
Cuisine American, Modern
Servings 12 slices
Calories 450 kcal

Equipment

  • Mixing bowls
  • Electric mixer
  • 8-Inch Cake Pans
  • Cooling rack
  • Blacklight

Ingredients
  

  • 3 cups all-purpose flour
  • 2 1/2 tsp baking powder
  • 1/2 tsp baking soda
  • 1/2 tsp salt
  • 1 cup unsalted butter softened
  • 2 cups granulated sugar
  • 4 large eggs
  • 1 tbsp vanilla extract
  • 1 1/4 cups tonic water for UV-reactive glow
  • 1/2 cup buttermilk
  • 1/4 tsp vitamin B2 powder optional, for enhanced glow
  • 5 colors neon food coloring pink, green, blue, yellow, and purple
  • 3 cups buttercream frosting for layering and decorating

Instructions
 

  • Preheat the oven to 350°F (175°C) and grease five 8-inch cake pans.
  • In a mixing bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
  • In a separate bowl, beat the butter and sugar with an electric mixer until light and fluffy.
  • Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract.
  • Gradually add the dry ingredients, alternating with the tonic water and buttermilk, mixing until just combined.
  • Divide the batter evenly into five bowls. Add a different neon food coloring to each bowl and mix until vibrant.
  • Pour each colored batter into its own cake pan and bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
  • Let the cakes cool in the pans for 10 minutes, then transfer to a cooling rack to cool completely.
  • Once cooled, layer the cakes with buttercream frosting between each layer.
  • Frost the outside of the cake with a smooth buttercream finish or decorate with additional neon designs.
  • Place the cake under a blacklight to reveal the glowing layers before serving.

Notes

  • Storage: Store in the refrigerator for up to 3 days. Bring to room temperature before serving.
  • Extra Glow: Use vitamin B2 powder (riboflavin) in the batter to enhance the glow under blacklight.
  • Alternative Frosting: Add neon gel food coloring to buttercream for an even brighter effect.
Keyword Blacklight Dessert, Glow in the Dark Cake, Neon Layer Cake, Rainbow Layer Cake, UV-Reactive Cake