For these cupcakes, I recommend the Royal Blue gel color from AmeriColor. You can use it as-is, but I like adding a touch of black to deepen the color to match my cupcake liners. Since this is a larger batch of blue, you’ll need a fair amount to get the dark color. Start with around 1/2 teaspoon and add more as needed.
I recommend dipping a toothpick into the black gel color and running the toothpick through the frosting. Mix that in first, and if you still wish to go darker, repeat the process with a clean toothpick. This avoids coloring the frosting too dark right off the bat. Both of these colors are also a part of my favorite 12-pack starter kit.
Looking for more? See my full tutorial on how to color buttercream for helpful tips and details.
