Alcohol Extraction | Cannabis Wiki
Alcohol extraction is a method which uses alcohol (preferably ethyl alcohol, but isopropyl alcohol as well) as a solvent to strip cannabis trichomes and essential oils. The cannabis plant is washed in the alcohol and the remaining alcohol is evaporated off, leaving behind a golden hash oil. Further processing via heat, agitation, or vacuum pressure helps remove any residual alcohol from the oil (which is essential prior to smoking). These additional processes also result in different textures such as shatter and budder.