Preheat the oven to 350 degrees.
Line a muffin tin with cupcake liners.
Add cake mix, water, vegetable oil, and eggs to a large bowl and beat on medium for 2 minutes.
Divide mixture between two smaller bowls.
Add black food coloring to one bowl and stir well, until the color is consistent, and as dark as you want. I used 20 drops.
Add red and yellow food coloring to one bowl and stir well, until the color is consistent, and as dark as you want. I used 20 drops of red and 12 drops of yellow.
Use a spoon to drop a small spoonful of orange batter into each cupcake liner.
Next, use a spoon to drop a small spoonful of black batter into each cupcake liner.
Alternate between the two colors until you have filled each cupcake liner halfway, and you have run out of cake batter.
Lightly tap the pan down on the counter to even the batter out, and place the pans in the oven.