A diffusion process following Fickด s second law should lead to a reduced slope and a constant or falling concentration close to the interface.
At week 15 the concentration gradient almost has disappeared, and the concentration close to the filling is comparable to the rest of the system. Capillary penetration has also been suggested as an explanationfor fat migration in chocolate systems.
Further, protrusions originatingfrom flow through surface pores have been characterized using profilometry, LV SEM and confocal Raman microscopy.
However, measurements of the porosity using mercury porosimetry suggests that the pore volume is between 1% and 4%, which is a too small volume to explain the observed penetration.