Before we get too into the weeds (pun intended), let’s talk about live rosin’s less refined counterpart. Rosin is a type of weed extract derived from flower, hash, or kief. Unlike solvent-based techniques that use harsh solvents like ethanol, CO2, or butane, rosin can be made at home using a hair straightener or using an industrial live rosin press in a commercial setting which applies heat and pressure alone to separate the desired compounds.