Tijkens et al. [142] modelled the effect of pH on the color degradation of blanched broccoli with five different acids. The fundamental pathways were simplified for the blanched product under study, and attention was solely devoted to the behavior of coloring compounds, expressed as observed color in blanched produce. This simplified model is based on the degradation of chlorophyll and, therefore, the green color, as a function of time and pH. They concluded that color of blanched and thawed broccoli strongly depends on the pH of the surrounding environ- ment. The more acidic, the faster the discoloration. The hydrophobicity of the acids, used to impose a certain pH, had a marked effect on the rate of discoloration: the more hydrophobic, the faster the rate of color change. pH boundaries at the transition between environment and product cannot be neglected. A separate process at neutral and higher pH values gradually takes over the acidic extraction of magnesium ions from the chlorophyll. This latter process is, at least in the pH region studied here, independent of pH.