Natural blue food is rare and perfect blue food is even rarer than the ones you will find. Food turns blue due to the presence of a pigment called anthocyanin and this pigment is very unstable. Here we focus on some natural blue food.
Blueberries: Most fruits are acidic and anthocyanin reacts with acid and alkaline. When we pick blueberries they look blue but if you crash it, it turns red because it contacts with its acid. If you want to make pancake batter or muffin mix with blueberries avoid baking soda or give less amount to keep the color right or add more acid, such as lemon juice or buttermilk.
Blue Corn: They are deep blue and when you cut them, they turn purple. Use blue cornmeal in cornbread or tortillas.
Red Cabbage: Very good natural blue dye is available from red cabbage. Slice the cabbage and boil for 10-15 minutes, then strain out the cabbage and boil the liquid until it becomes syrupy. Use this dye in cake batters and cookies if you want the blue.
Blue, green, and red are the three primary colors of pigments. And it’s been an important color for decoration since the ancient period.