How To Make A Rainbow Cake That Tastes As Good As It Looks

Ingredients

• 2 boxes vanilla cake mix (Betty Crocker Super Moist Delights French Vanilla)
• 2 cups water
• 1 cup vegetable oil
• 6 eggs
• 6 drops blue Americolor Softgel Paste food coloring
• 6 drops red Americolor Softgel Paste food coloring
• 6 drops green Americolor Softgel Paste food coloring
• 6 drops yellow Americolor Softgel Paste food coloring
• 6 drops orange Americolor Softgel Paste food coloring
• 6 drops purple Americolor Softgel Paste food coloring
• 2 cups unsalted butter, softened
• 8 cups powdered sugar
• 2 teaspoons pure vanilla extract
• 1 teaspoon salt
• 3 tablespoons milk
• 1 cup unsalted butter, softened
• 4 cups powdered sugar
• 1 teaspoon pure vanilla extract
• 1/2 teaspoon salt
• 2 tablespoons milk