Rosin refers to an extraction process that utilizes a combination of heat and pressure to nearly instantaneously squeeze resinous sap from your initial starting material. The term “rosin” originated as a method of making a product used to create friction with violin bows on how safe is buying weed online.
Rosin is drawn directly from living trees in a tapping process–in much the same way that maple syrup is collected (the process in no way harms the tree). First, a small area of the tree’s outer bark is removed. Then the tree is fitted with a drip channel and collection container. Finally, the tree is cut with V-shaped grooves about 1 cm (.39 inch) wide just above the drip channel. These marks induce the flow of resin into the container (the cuts must be renewed every five days or so to ensure the continuous flow of tree resin).
After the resin is collected, it is sometimes mixed with other tree saps—usually from larches, spruces, or firs—to create a specialized formula (rosin makers are as secretive about their individual recipes as violin makers are with varnish). This formula is then purified by straining and heating it in large vats until the resins are completely melted. Once cooked, the concoction is poured into molds. After the mixture sets for about 30 minutes, the rosin is smoothed down and polished. Rosin is packed into a swath of cloth or fitted into a tight-sealing container.
How Is Rosin Made?
The science behind rosin is simple: Applying heat melts the terpenes and cannabinoids into a pliable resin. Then the resin is squeezed using a press.
This efficient isolation of terpenes from chlorophyll and plant lipids offers a flavorful profile, one that is almost impossible to replicate by smoking or vaping raw buds.
One of the solid advantages of rosin is the speed and ease of extraction: A tasty and potent batch of rosin can be produced in moments and consumed immediately using inexpensive equipment and minimal risk of physical injury.
There is a bit of a learning curve when using a rosin process at home. This is due to some of the lipids and waxes melting at the same temperatures.
This results in the finished product generally not being as refined as material produced using solvent-based extraction methods.
But with training and experience, the end product can rival solvent extracts.
Today, solventless cannabis products can be found in everything from CBD oil to THC topicals or capsules, edibles, tinctures, vape cartridges and much more.
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What Is The Difference Between Rosin And BHO?
The initial process of butane extraction is to “run” butane through raw cannabis buds to dissolve the cannabinoids, terpenes, and other active ingredients from the plant matter, then evaporate the solvent.
What’s left behind is highly concentrated resin with trace amounts of solvent. That solvent is then purged, using additional step(s).
The purge process may depend on a number of factors: the physical qualities of the plant matter used; the quality of the resulting resin and the desired end product—shatter, wax, sauce, etc.
A concern for many consumers and medical patients with solvent processing, is the potential for residual hydrocarbons remaining in the product even after is has been purged.
That said, there are some health benefits to hydrocarbon extraction, namely that it strips away or neutralizes biological impurities including bacteria, mold, and other contaminants.
Additionally, the start-up costs of this method are very high compared to a solventless extraction: The cost of the safety equipment needed, and laboratory modifications, exceeds the cost of even an elaborate large-scale rosin operation.