Various optical colors of the objects classified as red quasars and BAL quasars. The small black dots are the colors of stars in SDSS DR2. The blue boxes are the representation of the quasars contours of the SDSS z < 3 from Richards et al. (2004). Note that most of our red quasars and all of the BAL quasars lie outside those boxes and that the red quasars often fall into the stellar locus making it difficult for typical quasar search algorithms to find these objects.