I remembered hearing that once upon a time, before cocoa was alkalized as part of the production process, it was red. I looked that up, and found the article listed below. Essentially, "devils food" cake was called that because it was red because of the color of the cocoa. I had heard that red food dye was not always part of red velvet cakes (since the cocoa was red).

Happy Valentines Day!!

https://www.smithsonianmag.com/smart-news/natural-chocolate-actually-reddish-color-180952207/