This work presents and compares experimental and numerical results obtained for the light scattered by micron-sized spherical particles (glass, silica) coated with non-absorbing and absorbing mantles (graphite, organic black paint). The comparison validates the use of light scattering studies for the determination of the physical parameters of dust particles, especially the determination of complex optical indices and thickness of absorbing mantles. This approach is of interest to validate experimental or numerical results, and to interpret remote light scattering observations, particularly those related to compact particles possibly covered with mantles.