Hau, and Hwang (2005), who reported that the values of a* and b* decrease significantly as the frying temperature increases above 100 C because of carotenoids’ instability. In fact, we found good linear correlations between a* and trans b-carotene content (r2 = 0.95), b* and trans a-carotene content (r 2 = 0.78) and hue and total carotenoids content (r 2 = 0.91) when comparing valuesof fried crisps at bubble-end point.