The blueberry is a true blue food. It derives its bold coloring form the high content of anthocyanin. Anthocyanin is a water soluble pigment that imparts colors ranging from blue to shades of red. Blueberry color is an important quality factor influencing fresh-market value and the suitability of the berries of the berries for processing. Their intense red to blue color, and high pigment content, makes them a good candidate for colorant ingredients for foods.
Blueberries begin their life as a little, green berry.
Fertilization of the ovary Flower swells rapidly for about a month and then stops. Green berry develops with no change in size. Calyx end turns purplish and rest of berry becomes translucent in appearance. Next few days a light purple color begins to develop and then deeper purple. During color change the berry volume increases rapidly.