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color of hairs isn't as important as color of tricomes .
u need to go to radio shack or a hobby shop and buy a cheap 30x or 100x handheld aka pocket miceoscope . you'll then be able to see tricomes / resin glands . and harvest when 1/2 are amber 1/2 are milky . a very worthwhile investment .
peace
if you go that long, you will lose some THC potency, and change the type of 'high' ... the THC is at its peak potency when all trichomes are cloudy (color of the pistils or 'hairs' is irrelevant, means nothing regarding potency) ... as the THC ages, the trichomes will turn amber ... amber trichs are a sign the THC is degrading, and the CBDs are forming ... CBDs are responsible for the 'body stone', and some people find this desirable ... the CBDs are also thought to be beneficial against inflammation, helping arthritic-type ailments ... :smokin: