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The ratio changes later in harvest. The color of the resin is pretty arbitrary. Amber is variety dependent. I have stuff that only ambers when its damaged. Others that fully amber after harvest.

Most stuff is 10 weeks of 12 hr photo period. Some stuff is 8 and at worst 12-14 for your under-bred sativas. I've harvested the same cut at 9 weeks and 13 weeks both giving about 20%THC and almost no CBN. Sometimes, a clone might take longer from various factors than it usually does.

The THC declines earlier than CBD. Your ratio shifts towards higher CBD later in harvest. CBN is variety dependent but does increase somewhat with later harvesting. You will always see steady decline after 12 weeks if it is not a pure sativa.

Our 'Cannatonic' was 11.1% CBD at 12 weeks and 12.9% CBD at 10 weeks. That is a lot less decline than 12% to 7%.

I do 'Pennywise' at 8 weeks and get similar numbers to the 'Cannatonic.' It puts on flowers weeks faster than 'Cannatonic'

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It is interesting that the time of harvest controls the "high" of the buds. If harvested "early" with only a few of the pistils turned color, the buds will have a more pure THC content and will have less THC that has turned to CBD and CBN's. The lessor psychoactive substances will create the bouquet of the pot, and control the amount of stoneyness and stupidness associated with the high. A pure THC content is very cerebral, while high THC, high CBD, CBN content will make the plants more of a stupid, or hazy buzz. Buds taken later, when fully ripened will normally have these higher CBN, CBD levels and may not be what you prefer once you try different samples picked at different times.

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