At Harborside Health Center (HHC) we have several different designations for the various types of concentrates. Super Melt is a solvent derived extract, which is usually butane. Although we are increasingly seeing Super Melts being made with CO2, ether, and occasionally oxygen. The advantage of solvent extracted hash is that the solvents pull a higher THC percentage per gram out of the plant material. THC percentages as high as 70% and higher are seen with solvent concentrates. The other two main classes of hash seen are dry sieved and pressed kief and cold water extraction. With the dry process, plant material is rubbed or agitated mechanically over a silkscreen. The resulting trichomes may be pressed with or without heat to produce hash. There are several pressing methods including high pressure jacks specially modified to press the kief into hash. Water processed hash, commonly referred to as “Cold Water Hash,” is the most common hash we see at HHC. With cold water hash, plant material is agitated with cold water and ice. The resulting slurry is passed through an increasingly smaller set of silkscreens. There are 2, 3, and 5-7 screen systems/methods. The final screen generally contains the highest quality hash. After scraping the wet hash off the screen, it needs to dried for 2-3 weeks. Amongst the cold water we have several different designations. Full Melt hash does exactly that; it melts into a liquid under heat. Bubble hash will bubble but not melt completely. Hash will burn but not bubble or melt, although it can still have a high percentage of THC. Oils are generally also solvent extracted and are usually made with Butane but also CO2 or oxygen.