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We compare the recent experimentally measured forces between chargedcolloidal particles, as well as their effective surface potentials (surfacecharge) in the presence of multivalent counterions in a bathing monovalent saltsolution, with the predictions of the dressed ion theory of strongly chargedcolloidal systems. The benchmark for comparison is provided by the DLVO theoryand the deviations from its predictions at small separations are taken as anindication of the additional non-DLVO attractions that can be fitted by anadditional phenomenological exponential term. The parameters characterizingthis non-DLVO exponential term as well as the dependencies of the effectivepotential on the counterion concentration and valency predicted by the dressedion theory are well within the experimental values. This suggests that thedeviations from the DLVO theory are probably caused by ion correlations asformalized within the dressed ion theory.

Interactions between Charged Particles with bathing Multivalent Counterions: Experiments {\it vs} Dressed Ion Theory