Color changes in peanut butter resulting from electron beam and gamma irradiation were reported. Ban and Kang (2014) reported that gamma irradiation in excess of 3 kGy decreased the L∗ value of peanut butter. And El-Rawas et al. (2012) reported that during electron beam radiation color changes of peanut butter occurred. L, a, and b values of microwave-treated samples were not significantly different from those of non-treated samples ( Table 2). L values decreased as microwave power increased from 0 (non-treated sample) to 6 kW, but these differences were not significant (P > 0.05). Ha et al. (2013) reported that there were no significant color changes during pasteurization of peanut butter crackers by RF treatment.