I experimented with this on my last grow. It was Nirvana BB x NL. At harvest time, I let half of the crop sit in darkness for 48 hrs. The rest I harvested right away(yes the test group got two more days). It was REALLY close. I had three other people look at the buds with me from botch harvests. I can say with much certanty that the group exposed to the dark period has a LITTLE more cystals on them. But that is what this is all about, a bunch of little changes to hopefully make one BIG one.

Jer