What is Hash Rosin?

What is Hash Rosin?

Proper’s rosin is full spectrum Hash Rosin, meaning it begins as ice water hash, which is a collection of trichome heads that are suspended in water and then filtered through a series of screens. The filtered material is then freeze dried and refined using only heat and pressure—no solvents. The final product has a badder-like consistency and the same full-spectrum of cannabinoids and terpenes as our other extracts.

Growing and Harvesting for Solventless

We seek out strain phenotypes that are well suited for rosin. From our genetic library, this includes Alien Rock Candy, Love Affair, Cookies and Cream, Fatso, and GMO Cookies.


Harvesting flower for our solventless products is a gentle, meticulous process. Each bud is hand manicured, put onto trays, then cryogenically frozen. The frozen product is held in our freezer until extraction.

rosin in jar on a dark background with a lid and box

Making Hash Rosin

Proper uses a commercial Lowtemp Industries Chilled Osprey to ensure we’re processing flower at the lowest temperature possible with the cleanest results. All ice water hash is processed in food grade passivated 304 stainless steel. Once washed, the ice water hash is pressed at the lowest temperatures possible in small batches to ensure consistent quality. 


Our rosin is filtered down to a 25μm screen.

Storing Rosin

We strongly recommend storing your rosin jars in the refrigerator. Let the rosin come to room temperature before opening the jar; this will help avoid condensation building inside.

Frequently asked questions about rosin.

  • Will Proper sell ice water hash?

    It is unlikely, due to the difficulty to transport. Ice water hash must remain cold or it will melt. We will not put out a product that we cannot guarantee will reach patients in an acceptable manner.

  • Will Proper make rosin cartridges?

    Rosin carts are in the works, coming early 2023 most likely.

  • Why isn’t my favorite strain available as rosin?

    Not all strains wash well. If the yield is too low, we will not make rosin with it.

  • What’s the difference between Proper’s rosin and live resin extraction?

    Rosin is made using only water, heat and pressure (no solvents). Our live resin products are made using butane (a solvent) extraction, which is purged from the product before going to patients. Ultimately, rosin and badder share a nearly indistinguishable appearance and consistency.

  • Which is more potent: rosin or live resin?

    Neither; they have similar levels of THC.