  We report a search for the presence of dust in the intra-cluster medium based
on the study of statistical reddening of background galaxies. Armed with the
Red Sequence Cluster survey data, from which we extracted (i) a catalog of 458
clusters with z_clust < 0.5 and (ii) a catalog of ~90,000 galaxies with
photometric redshift 0.5 < z_ph < 0.8 and photometric redshift uncertainty
delta z_ph / (1+z_ph) < 0.06, we have constructed several samples of galaxies
according to their projected distances to the cluster centers. No significant
color differences [<E(B-R_c)> = 0.005 pm 0.008, and <E(V-z')> = 0.000 pm 0.008]
were found for galaxies background to the clusters, compared to the references.
Assuming a Galactic extinction law, we derive an average visual extinction of
<A_V> = 0.004 pm 0.010 towards the inner 1x R_200 of clusters.
