Kief is the fine powdery resin that accumulates at the bottom of a cannabis grinder with a screen. As flower is ground, trichome heads detach and fall through the screen. Kief is higher in cannabinoids and terpenes than the flower it came from — essentially a simple dry-sieve concentrate. Commercial kief production uses mechanical dry-sifting: cured flower is agitated over a fine mesh screen, and the kief collects below. Traditional Moroccan hash production (the iconic "red Lebanese" or "black Afghan" hash you've heard mentioned in cannabis culture) historically started as dry-sifted kief that was then gently heated and pressed into hash bricks. For connoisseurs, kief can be sprinkled into flower to enhance potency, pressed into rosin for a kief-rosin (better yield than flower rosin but lower quality than hash rosin), or simply dabbed on its own.
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