In this process of reversing charge, the droplets of SB latex undergo coa- lescence [27, 28] and give rise to the larger droplets of cationic SB latex. The measured zeta potentials of an anionic SB and a cationic SB are−32 mV and+35 mV, respectively.The cationic particles were washed and centrifuged three times and we did not observe any change in particle size before and after washing. Removal of the polymer from the surface after washing could have led to bridge flocculation, and this was not observed. More importantly, we also meas- ured the zeta potential between washings, and this did not change. Therefore, the PDADMAC remained fixed to the sur- face, and particle aggregation was not observed after washing.