Unfortunately, it's from not a duncan, so colour codes are no good. It's from a guitar that was originally bought at Wal-mart. I took it apart for something to do.
in my experience it's easy to tell if you have a ceramic because it's basically black and doesn't really feel the same as metal.
the alnico's are much harder to tell apart since they are just look like a bar of silver-ish metal. Though the A8's I've had have been darker than the other alnico types.