CAFOS spectra of two rejected known WDs (plotted in red on top), CA192 = WD 1004+665, CA308 = LSPM J1445+2527, a rejected new DZ candidate (black), and a known DZ WD. CA323 = WD 1532+129, (plotted in red on bottom). The spectral types of known objects with typical errors of less than about 0.1 subtypes are taken from the following references: (1) = Limoges et al. (2015) and (54) = Sayres et al. (2012). Locations of the strongest metallic lines in the spectrum of the known DZ WD and of a terrestrial absorption band are marked on the bottom. Those of the Balmer lines, the Ca H and K lines, and the CH band are marked on top.