This is shown by a* values of both modes (Fig 3b and 3d) which their values increase as pH decrease. In contrast, when the extracts changed into a basic condition, the color of the extract was shifted to green, a* values decrease as pH increase. The color change of the extract is resulted from a change in structure of anthocyanins which support more or less conjugated system resulting in the shift of color in visible light spectrum (Walkowiak-Tomczak & Czapski, 2007).