Anthocyanins
Anthocyanins are water-soluble vacuolar flavonoid pig- ments; they are widely distributed in nature, among flow- ers, fruits and vegetable, and are responsible for their bright colors such as green, red and blue [73, 87]. Significant properties of anthocyanin extracts are color density and color hue. These can be affected by pH, SO2, heat, light, metals, copigmentation and ‘thin film’ effects and others [86]. With increasing pH values anthocyanin color becomes paler, however, if the product being colored contains components capable of acting as copigments, color may be retained and also light stabilized to a certain extent [10].