cannabis

Because all the alcohol will be removed by evaporation before the tar is used, one may use isopropyl rubbing alcohol instead. Be sure not to use any denaturated alcohol as this will leave a horrid tasting residue. Pay caution not to let the alcohol boil over marijuana seeds. Remember that the boiling point is lower than that of water and that alcohol is combustible. The use of a gas burner is discouraged. After the boiling strain the boiled materials and save the green solution. Add more alcohol to the mash while it is still damp and repeat the boiling (45 mins). Strain and combine the extraction with the first one. Fill a cleaned double boiler half the way with the extractions. Heat without a lid in well ventilated conditions until the liquids have boiled down to half the original. Add more solvent to bring the liquids back to the halfway mark. After all the extractions are added this way continue boiling until the scent of alcohol is no longer detectable.