Fig. 8. Effect of pH on the a) lightness (L*) and b) electrical charged (ζ-potential) of homogenized 10% MWP systems. Inset is the visual photographs of the nonhomogenized (bottom) and homogenized (top) systems at different pH, with increasing
pH from left to right. Sedimentation was observed in the non-homogenized samples as demonstrated by the arrow in one sample (bottom).