Traditional red velvet cupcakes are made red from the chemical reaction between buttermilk (which is acidic) and cocoa powder. However, since we are making these cupcakes vegan, I used natural food coloring from Supernatural to color the cupcakes. Make sure to double-check the red food coloring you use, as not every brand is vegan. Also, I do want to note the red food coloring is just for appearance, so if you don't want to use any food coloring, it won't affect the taste of these cupcakes!