// Definition
The solventless extraction of cannabis resin using heat and pressure, forcing trichome oil through a filter bag onto parchment paper or PTFE sheets. Considered one of the two greatest cannabis processing innovations alongside water hash, rosin made concentrate production accessible and safe compared to BHO.
// From the Episode
Bubbleman credited the hair straightener as 'probably the greatest cannabis invention since water hash' for democratizing concentrate production. Multiple panelists discussed how rosin created a market for mid-grade bubble hash (4-star) that previously had limited use, enabling hashmakers to fund their full melt operations through rosin sales. Aten reported California retail rosin prices ranging $30-50/gram, with 710 Labs at the premium end maintaining cold chain.