Shelled Spanish peanut kernels were subjected to repeated cycles of rewetting and drying at three levels of drying relative humidity (20%, 40% and 60%) and a single level of rewetting humidity (90%). Temperature was constant at 40 °C for all the experiments. Effects of relative humidity, number of rewetting-drying cycles, and the level of moisture content on the percentage of blanching were observed and analyzed. The number of rewetting-drying cycles, and the relative humidity of the drying air were found to be highly significant. Univariate models predicting blanching percentage as a function of the number of cycles of operation at fixed relative humidity levels, and bivariate model predicting blanching percentage as a function of drying relative humidity and number of cycles were fit to the experimental data. Skin moisture content and moisture history are suggested as important factors in peanut kernel blanching.