Hash (short for hashish) is compressed cannabis resin, traditionally produced through hand-rubbing (charas), dry-sieving (kief collection and pressing), or ice-water extraction (modern connoisseur technique). Hash has been consumed for millennia — hand-rubbed charas from the Hindu Kush region of Afghanistan and Pakistan predates any modern extraction technique by centuries. Modern hash production focuses on ice-water extraction: cannabis flower is agitated in ice water, which brittle-shears the trichome heads off the plant. The water is then filtered through a series of progressively finer micron screens (220μ to 25μ), producing wet hash. The wet hash is freeze-dried to remove moisture without heat damage to terpenes. The resulting dry hash is the precursor material for modern solventless rosin pressing — the hash goes into a micron-mesh bag, heated plates press it, and the oil that flows out is rosin.
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