Blackberries are characterized by their coloring, their unique composition and their flavor. Blackberries do not have a hollow center, instead they have a solid, edible core. When ripe, Blackberries have a deep inky sheen with purple highlights. They are succulent, soft, and juicy. Their flavor is sweet, slightly tart, with earthy undertones. Blackberries are a good source of vitamins A and C, iron, calcium and dietary fiber. Blackberries get their dark purple pigmentation from the phytonutrient anthocyanin, which also has antioxidant properties.