While I am *FAR* from a lighting expert and barely qualified to even speak on this subject, I have been doing a bit of research on this over the past year as I begin to extend my range into chromakeying. David, would it be correct to say that given video camera's penchant for green, that doing greenscreen on video would likely produce cleaner keys in most instances? Of course barring circumstances where the subject needs to be wearinng green, or as you say, blondes keying better against blue.
As I've heard it, blue was popular on film because the film stocks were more blue sensitive. But shooting outdoors on production, using blue proved problematic, especially when having to shoot against the sky.
Again, this is all second hand for me as I've only ever played with keying from other's work. I've never shot it myself.