Just an addendum to the above...
To go from rosin, to winterized oil, you will need to dissolve the rosin in ethanol, and then proceed with the winterization process. The amount of ethanol needed should be less than 20% of that required to do the full extraction.
To go from rosin, to winterized oil, you will need to dissolve the rosin in ethanol, and then proceed with the winterization process. The amount of ethanol needed should be less than 20% of that required to do the full extraction.