You are correct sir. In addition, the butane method is also quite dangerous. So much so that it was very quickly made illegal here in CO to make your own extracts at home as multiple morons blew up their homes or apartments.This method is the ticket:
CO2 is a safe, clean, and versatile extraction method for botanical oils and concentrates. Let's explore why.www.edenlabs.com
The butane process leaves a residue because it doesn’t evaporate 100% from the butter. Or so they say.
For decades, I used the alcohol extraction method which is also kinda dangerous if you don't know how to properly handle alcohol vapor over a heat source.
Now, I just order online and pick up what I need at the dispensary. There is a lot to be said for convenience. 16 year old me would in awe.