There are no naturally blue foods in nature
While blue is indeed one of the rarest colors in nature's food palette, naturally blue foods such as blueberries and blue corn do exist.
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straightdope.com: Why is there no blue food? - The Straight Dope. straightdope.com. https://www.straightdope.com/21344119/why-is-there-no-blue-food
It discusses the common misconception that there is no blue food, noting that blueberries are blue on the vine.
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science.org: Discovery of a natural cyan blue: A unique food-sourced anthocyanin could replace synthetic brilliant blue | Science Advances. science.org. https://www.science.org/doi/10.1126/sciadv.abe7871
It notes that blue is rare in nature's food palette, confirming that natural blue food-sourced colorants and items do exist.
biology.stackexchange.com: Why are so few foods blue?. biology.stackexchange.com. https://biology.stackexchange.com/questions/56476/why-are-so-few-foods-blue
It confirms that blue foods exist, though they are rare compared to other colors.
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