Article by TG Branfalt Jr, Ganjapreneur It’s been more than a year since Phil “SoilGrown” Salazar posted a video to Instagram showing the world how to use a hair straightener to extract cannabis oils. That video has been cited as the flashpoint for the rise of solventless concentrates produced using pressure and heat — Salazar, … Continue reading Rosin Making Matures in the Year Following the ‘Hair Straightener Video’