This question is the classic example as to why judging harvest maturity based solely on trichome colour is problematic and why I prefer to base my harvest timing based on pistil condition.
This question also highlights and confirms all of what I have been saying about some strains never having amber trichomes and I hope the people whose questions I answered yesterday regarding harvest timing, read this question today.
All I can say to you at this stage, is to harvest ASAP, before the plant is completely dead.
I personally like to base my harvest timing on pistil colour, with 90-95% brown pistils being the optimal stage for flowers with peak THC levels. Waiting until all the pistils are brown will result in flowers with degraded THC and with elevated CBD and CBN levels, which gives a more sleepy and heavy body stone, as opposed to the clear and psychoactive mind trip of earlier harvested flowers.
So depending on which effect you prefer, let the pistil colour guide your harvest timing --- 90-95% brown pistils for head trip, all brown pistils for body stone.
Pistil colour/condition will more accurately reflect a plants health and it is plant health that determines trichome composition and not trichome colour on its own. If you are keen, scroll down this page and find the question submitted yesterday by czlok (how do I know is it ready to harvest?) and read a much more detailed answer that I gave on this very topic and which I think you will find useful for determining when to harvest your plants in the future.
Hope this helps,...........
Organoman.