Quote Originally Posted by AssertnFailure
If it was tsukuyomi, then the effects would've been instantaneous, instead of Itachi just sitting there with his face in front of Kakashi the whole time.
evenso, it was still a Kage bunshin. Always connected the mangekyo gentjutsu's with the black and white world.

But, Itachi did say it himself, it was a genjutsu.