  We present here tests of a five-filter photometric system aimed at WR
classification. In addition to the well-known easy separation between the WN
and WC spectral types, these tests indicate interesting potentialities in the
discrimination of subgroups among the WN and the WC which look well related to
the classical subtypes. The proposed combinations of filters (or derived ones)
bear enough discriminating power to satisfy some evolutionary studies in
crowded fields where spectroscopic follow-up is not possible.
