Rheological curves of the both formulations are showed in Figure 7. It can be noted that the viscosity of the suspensions decreases as shear rate increases. This is a typical behavior of a Bingham curve, which is desired for porcelain slip [17, 18]. It can be inferred from Figure 7 that the partial replacement of the feldspar flux did not change significantly the rheological behavior and the dispersant agent consumption (Figure 8). Thus, the leaching of ions from wollastonite raw material does not occur significantly. This could interfere with the stabilization of the slip. Thus, the control of viscosity and slip stabilization are practically the same as these of the feldspar slip.