Blood oranges are usually round, about 6 – 9 cm in diameter, medium-sized oranges with reddish flesh. The coloring is triggered by the so-called anthocyanins. This is a coloring agent which, when combined with the fruit acid, causes the flesh of the fruit to turn red at low temperatures. Depending on how low the temperatures were during the ripening of the blood orange, the redder the color will be. The Tarocco Orange has a significantly milder taste. This variety belongs to the half-blood oranges: They have reddish flesh, but their skin is orange. They have a great aroma and only a few bitter substances, so they are milder than Moro whole blood oranges.