The color development is a surface phenomena so that the surface potato strip temperature, Ts, rather than the oil temperature set point or the center strip temperature, should be used. Indeed, the oil temperature changes during frying with an initial rapid drop and a slow recovery (Kozempel, Tomasula, & Craig, 1991). Furthermore, the surface temperature may be greater than the central one, depending on the potato thickness (Singh, 1995) and also the coloring rate is moisture dependant, as expected. Then, the Arrhenius relationship should be written as follows