That's exactly what's happening and it's stunning... if you'd like to see an intense purple on fan leaves (and wherever the purple was, there were masses of trichomes), take a look at my Pink Kush.... some of the leaves were completely taken over by the purple (which was almost black!)
growdiaries.com/diaries/157106-grow-journal-by-growinggrannie/week/889355
Have fun with this beauty!