"Parchment is made with bleached white and unbleached brown paper. Since the bleached paper might contain toxic dioxin, it's better to use the unbleached parchment paper if you use it." This in pursuit of info regarding the possible contaminates in rosin from parchment paper. I'm kinda stuck on this idea of a "pure" extract. I really like the idea of no solvent. Now the fly in the ointment is a question of nasty chemicals leaching into the rosin from the heated parchment paper. Looking for info on that. Disclaimer: i've not made rosin before. I'd like to though.