Two-wavelength measurements of isotropic scattering coefficient in concentrated, multiply scattering colloidal suspensions are used to extract S(0,phi) values, using a small wave number expansion of the interparticle structure factor, S(q,phi). Owing to the small particle size (150 nm) and near-infrared wavelengths (670-820 nm) used in this study, the approximation is reasonable and allows accurate estimation of S(0,phi). The estimated values of S(0,phi) agree well with that predicted using the Carnahan-Starling equation of state.