SEM analysis reveals that the features of rubber particle surface are most probably proteins and phospholipids. In the case of fresh latex (Fig. 6A), a continuous electron-rich membrane was clearly observed around the rubber particle surface. Inside the rubber particle, in most cases, a homogenous electron density distribution was observed: a less dense region (dark gray) and a denser region (light gray). The centrifuged rubber particles (Fig. 6B) contain a gray ring, which is probably the phospholipid–protein layer. In the case of deproteinized (Fig. 6C) and saponified rubber particles of cream rubber (Fig. 6D), the gray rings were also observed. This is probably the surfactant layer. It is possible that surfactants could replace the phospholipid-protein layer for the stabilization of rubber particles after the removal of phospholipid–protein layer by deproteinization and saponification treatments. While the gray ring could not be observed in the small rubber particles (Fig. 6E), this may be due to the lower content of proteins and fatty acid esters, as given in Table 1.