For 1 cup Cake flour substitute: Take a leveled cup of all purpose flour. Remove 2 tablespoons of flour and then add 2 tablespoons of corn flour/corn starch. Mix and sift the flour 4-5 times. Using cake flour gives this cake a very light texture.
Gel food color yields a better red color.
The color of this cake is not bright red. If you want the cake to be bright red, use only 1 tablespoon of cocoa powder instead of 2.
Be careful when handling red food color. It can stain your counter and do not use your hands to mix once red color is added.