While almost all standard food coloring kits come with the color red, it's extremely difficult, if not impossible, to make your icing red rather than pink. It's true that simply adding more food coloring would eventually produce the shade you desire, but it would require so much coloring that the texture and flavor of the icing would change. Luckily, there is an easy method you can use to create a bright red icing without even a trace of pink.
Place the desired amount of white icing into a large bowl.
Add a bit of red gel food coloring to the icing and stir well with a plastic mixing spatula. Keep mixing, adding more coloring a little bit at a time until the icing is bright pink.
Sprinkle red powdered food coloring into the icing while you stir. Keep mixing until the icing has turned a bright red.
Allow the icing to sit for 10 minutes before using. During this time, the powdered food coloring will deepen and the color will set at a bold red.