// Definition
A solventless cannabis extraction method that uses heat and pressure to squeeze resin directly from cannabis flower, dry sift, or water hash onto parchment paper or PTFE film, producing a dabbable full-melt oil without any chemical solvents. Originally discovered when resin oozed from a trichome head pressed against a hot glass dish, the technique was popularised using hair straighteners at 350–400°F, with pressing taking only 2–30 seconds.
// From the Episode
This is the definitive ROSINTECH episode (Ep. 025). Jeff Church, Soil Grown, and others demonstrated pressing techniques while Mark Scialdone provided the underlying science: terpenes within the plant act as metastable solvents at elevated temperatures, and moisture creates a steam distillation effect carrying resin outward. Lab tests confirmed 73% THCA and 10.5% THC, proving minimal decarboxylation during brief heat exposure. All terpene levels actually increased in the rosin compared to starting material because decontamination concentrated the oils.
// Source
Ep. 025 The ROSINTECH Episode →