However, in every attempt where PDADMAC Fig. 2 Zeta potential and particle size as a function of the dropwise addition of an anionic PCC suspension (10% wt./wt.) to a stirred PDADMAC (2% wt./wt.) solutionwas added to a stirred suspension of PCC or SB, flocs were observed. The solution to avoid bridge flocculation was to perform the experiment in reverse. In this case, dilute suspen- sions of the anionic PCC and SB latex (10% wt./wt.) were added dropwise to a PDADMAC (2% wt./wt.) solution under constant stirring at 1000 RPM.