  We have studied several color-color infrared diagrams of the 276 late type
stars of the BIS catalog. For 95 of these stars we derived spectral
classification from our slit spectroscopy. From the 2MASS color diagram we
derive that none of the sample stars is a dwarf. The WISE 3.4-12 vs 12-22 plot
is the best to discriminate the variability type (Mira, irregular and
not-variable), as well as Carbon stars: IRAS colors are less useful due to the
poor quality of the data for most of the BIS stars. Mixed plots involving
2MASS, AKARI and WISE were also explored: the 2MASS-AKARI J-[S09] vs
[S09]-[L18] plot is efficient to discriminate Carbon and Mira stars. From the
color plots and our spectroscopy we can statistically predict that in whole BIS
catalog no other dusty Carbon star is present, while a few Miras and CH or R
Carbon stars could be discovered. Only about 15 percent of the BIS stars are of
early M type.
