I just attempted a Red Velvet cake...is there any reason why it didn't turn out red?

I just did a first attempt at a red velvet cake, and it was delicious and incredibly moist(I added coffee to the mix), however, when I put my red food colouring in, it really didn't change the colour...it was a very liquid based food colouring. It turned out to be a very delicious chocolate cake instead of a... show more I just did a first attempt at a red velvet cake, and it was delicious and incredibly moist(I added coffee to the mix), however, when I put my red food colouring in, it really didn't change the colour...it was a very liquid based food colouring. It turned out to be a very delicious chocolate cake instead of a very delicious red velvet cake.
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