Figure 1. A part of the IRAS color--color diagram, from which the initial sample of 4500 sources was selected.
Known B[e]WD are shown by filled circles; VV Cep binaries by open squares; carbon stars by downward
triangles; M-type stars including Miras by dots; WR stars  by pluses; RV Tau stars by open diamonds,
and new B[e]WD candidates by asterisks. The solid line represents IS extinction, starting at the
photospheric colors and ending at A_V=20 mag. The most probable location of B[e]WD is
shown by the dash-lined box.