TiN is gold-colored.
TiC, if I remember correctly, is gray-colored. If the subject is a carbide insert, this means the metallographic lab will probably need to have expensive diamond-imbedded discs for grinding before lapping, since regular silicon carbide discs aren't hard enough for the task. You may be able to go directly from a diamond wafer cut surface to diamond lapping - I've never tried it myself. My SEM can detect both carbon and nitrogen. Apparently, your EDS detector uses a beryllium window.