The other day I was sipping coffee at a cafe and I overheard the chef say to a customer, “Name one natural food that is blue?” No, not blueberries those are purple but, the customer had nothing to answer and the chef said, “Yup, no blue foods are natural.” Well, I sat there and immediately thought of a few things I eat that I consider blue. The borage flower for one, but that’s a bit obscure for most folks, even some chefs.
The real problem with the chef’s question is that it was based on the limitations of human color perception. I can’t claim to understand color perception well but I understand enough to know that claiming that a color doesn’t occur naturally, in any subset of colorful items (i.e. food) is erroneous. Nature’s paint brush far exceeds our own limited imagination. If a color exists, nature has put it to use. In fact, it’s my suspicion that we’ve barely cracked that paint box open, even within the spectrum of what we can see.