Rosing is the concentrate that is achieved when heat and pressure are both applied to cannabis. Many users like rosin because it is free of the chemicals and solvents that are used to make some of the other concentrates like butane hash oil. Rosin doesn’t require any solvents to make it and it can be used to convert hash into a concentrate that can then be dabbed. Heat and pressure are used to force compounds out of the trichome glands on the cannabis plant.
This is where the cannabinoids, terpenes, and THC are found. It can be thought of as a similar technique to squeezing the juice out of oranges or grapes. While the final result is fairly similar to butane hash oil, no harmful chemicals are used in processing rosin. Making rosin is considered to be safer than many of the other ways of making concentrates.
Rosin is available as wax, shatter, badder/budder, and taffy. Rosin is said to have originated loosely in around 2006, but it only started picking up in popularity in around 2015 when someone named Phil Salazar started to produce it and post pictures of his progress.
Initially, he was just trying to process hash by flattening it out, but he noticed the resin started pushing out of the sides which left the hash unusable. He started experimenting a little and took some hash, put it between some parchment paper, and then applied pressure against a heated dab nail. This is what created the oil that is now known to be rosin. Further experimentations later, he started using a hair straightener. Since then, rosin has been made with screens and industrial presses to make faster and larger quantities of the product.
Use of Term
I like to consume rosin much more than the other solvent based concentrates because it is free of these solvents.