well some of the best cured buds seem to have the "green" leeched out. The best dank has the grayish, drab olive, pale color. This is the chlorophyll dying, i think.
I just completed my first water cure and this was exactly how the buds ended up looking in the end. Very 'olive' green, and almost grey or purple. By the final day, the water no longer had any green tinge to it, so obviously the chlorophyll had all been leached out.
Very smooth smoke, and very potent.
Some blueberry buds that I cured in glass for a year ended up looking the same way. Blue tints with olive green buds.
It does seem that the chlorophyll is being metabolized by the plant in some way, and then dispersed into the atmosphere, possibly through evaporation.
Not sure about the details, but that is one obvious change at least.