Butane is a light-weight hydrocarbon of the same chemical family made of propane, ethane and methane. Butane is generated from crude oils from degrading deep below organic materials. Fractional distillation purifies the crudest oil into an odourless and combustible liquid and compresses the butane. For its purity and low boiling point, professional extraction firms utilise butane of instrument grade to enable more thorough extraction of cannabis compared to alternative solvents like carbon dioxide or ethanol. Cannabis concentrates have a lengthy history of developing hash or condensed cannabis resin as an ancient therapeutic medicine. D. Gold's book, about the arts of...