Rosin is a cannabis concentrate produced without solvents — the plant material (flower, kief, or hash) is pressed between heated plates at 180–210°F with 800–1,200 PSI, and the resulting oil is rosin. No butane, propane, CO₂, or ethanol touches the material. The first commercial rosin pressing emerged in the mid-2010s and quickly displaced BHO (butane hash oil) as the connoisseur-preferred concentrate category. Rosin has several grades based on starting material: flower rosin (pressed directly from flower, moderate yield), kief rosin (pressed from dry-sifted kief, better yield), and hash rosin (pressed from ice-water hash, highest yield and quality). Hash rosin pressed from 6-star ice-water hash is the current connoisseur gold standard. Rosin quality is graded on a 1–6 star melt scale based on residue behavior when dabbed. See the hash rosin explainer or the dab guide for more.
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