In order to describe the dielectric response of a dense suspension of polarizable spherical particles to an external low frequency field one has to find an appropriate expansion in density. Beyond the Clausius–Mossotti formula, which only is a mean field ansatz, a cluster expansion (Ref. 1) takes account of the interaction between particles. The one-particle–dipole polarizability being given, the terms up to second order in density including two-particle interaction can be calculated. With the help of this enhanced dipole-residual-interaction model the dispersion (low frequency response) of colloidal suspensions can be discussed more thoroughly than before.