Criteria for colloidal destabilization that we had imposed in earlier studies (Yeung et al., 2003 [1] and Esmaeili et al., 2012 [2]) are re-examined. Those conditions are shown here to be incorrect, but with only negligible error. We also note a minor issue with the widely-accepted condition of coagulation that is seen in almost all colloids literature. (C) 2014 Elsevier Inc. All rights reserved.