However, the small reduction of this value almost did not affect the visual color of SJ. This result suggests that the brightness is relatively stable to thermal treatment when the pH of SJ is 2.0. At 100 C, a* showed a descending trend similar to that of L* as heating proceeded (Fig. 1c). However, at 80 C and 90 C, a* slightly changed within 50 min. This result implies that a* is more stable than L* at high temperatures.