Yes, alcohol also dissolves the chlorophyll and some phytochemicals not extracted by butane (or other hydrocarbons). Back before 1936, it was common for the pharmacy to obtain plant material and the "chemist," or pharmacist, to prepare extracts and fluidextracts according to approved recipes spelled out in this book. Obviously alcohol extracts could be used directly since they weren't toxic, and a little 150 proof alcohol probably helped a little ;) I used to work in two old pharmacies that had been in the same locations since 1875! One of the pharmacists was in his 70's and had been compounding plant medicines since the 1920's. We had an old soda fountain and all kinds of cool old bottles of plant extracts stored in the dusty basement. So cool!