When I went to Whole Foods to pick up a jar of frosting, I also picked up food coloring to color that frosting (and we all know how that went).
So when I wanted to color white cake, I used these same colorings. These are the cupcakes from the outside:
And this is the insides:
That white? That's supposed to be blue. So disappointing. Whole Foods can't even do food coloring right.