I've done RSO for years whenever I've gotten an itch for an extract
@WildBill . I freeze the 62%RH herb, and put my stainless double walled cocktail pitcher & 100% rubbing alcohol into the freezer to bring them to the same temp as the herb. Then I put the herb, and alcohol in the pitcher. Swish for 30-60 seconds, and pour it through a stainless flour sieve into a Pyrex baking dish. Then, let it stand for a day or two to let it evaporate with zero heat application. Viola.
Edit:
@Frank the Dank, mine has always tasted clean. But I've tried it with Everclear and it almost killed me..