The vibrant purple color of cooked blueberries comes from anthocyanins, natural pigments that change color depending on pH.

In an acidic environment (like lemon juice in your filling), they appear redder, while in a basic environment, they lean toward blue.

#science #sciencefacts #blueberries #blueberrypie #anthocyanin #naturalpigments #acidicenvironment #basicenvironment