What is the difference between live resin and live rosin?
The word they share is live, and it means the same thing in both: the flower was frozen the day it was cut instead of being hung to dry. The difference is what happens next.
- Live resin is a solvent wash. The frozen plant goes into a closed-loop machine, cold butane or propane pulls the oil out, and the solvent is boiled off under vacuum. California's regulations call butane and propane volatile solvents and put that work under a Type 7 manufacturing license.
- Live rosin is a press. The frozen flower is usually washed in ice water first to collect the trichome heads as hash, and that hash is squeezed between heated plates until the oil runs out. Nothing but heat and pressure touches it. The state files that under mechanical extraction, the first method on its list, and a Type 6 license covers it.
So every live rosin is solventless and no live resin is. That is the whole distinction. Worth noticing: not one product on either of our menus uses the word solventless in its name. The word to look for is rosin.
A 2021 review in the Journal of Cannabis Research puts the press plainly: "Rosin extraction uses compression and heat to obtain oils and rosin." It also adds a caution the marketing skips. Because a press cannot reach high pressure at low temperature, the review says "the retention of terpenes is limited." Solventless describes what touched the oil. It says nothing about how the jar will taste.

