chasv77answered grow question 5 years ago I just harvested GG, and there were a variation of colors on my buds, depending on how close they were to the light, etc.
I had purple buds, and buds that produced white cotton tops, that were closer to the lights.
I would not use any of these buds colors, to determine my maturation of when to harvest. Just track the trichomes. - - -> FYI, I did 67 days in flower (using 180W of light), after signs of pistils.
BTW, I am enjoying all of these types of cured buds, and guarantee you will love it all.