3.4. Colorimetric evaluation of transverse section of nine sweet potato cultivars For the Hunter color coordinates of the transverse sections of the nine Korean cultural varieties, the lowest L' lightness) and b* cultivars (yellowness) values were obtained in two purple-fleshed cultivars Sinjami and Yeonjami (Table 4). The two samples of orange-fleshed cultivars juhwangmi and Sinhwangmi displayed higher a ,(redness) values than the others. Sinjami, Yeonjami and Hayanmi presented lower b* values than the others. A A clear orange color was displayed in t cortex of juhwangmi compared to the other parts After baking, L', a* and b* values generally decreased for all of the nine cultural varieties, and the a value profoundly reduced than b value. The reduction values were approximately 20 and 17 for Sinjami and Sinhwangmi, respectively. Variations in the b value were low for the three yellowish white-fleshed cultivars, Yulmi Daeyumi and Hayanmi. Interestingly, higher b* value was found in Yulmi after baking. While the total color differences (AE) before and after baking were more than 25 in Sinhwangmi, Yeonhwangmi and Jinhongmi, the values were less than 20 in Yeonjami, Yulmi and Daeyumi (Table 4)