That shop does chrome plating for metal. Its a different process for these plastic emblems. Its just a reflective coating that is not applied like real chrome. Someone here did Black Chrome Emblems...can't remember who though.
Edit: Found the PM.. @
20valvewynn83 had his done. You can PM him about it or see his thread.
http://www.ft86club.com/forums/showthread.php?t=16714
You can get them already made from
http://www.nengun.com/grazio/toyota-emblem-set