Rosin refers to an solventless 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 lubricate violin bows. The result is a translucent, sappy, and sometimes shatter-like product.
Rosin retains all the valuable terpenes that account for aroma and flavor without a single parts per million (PPM) of residual hydrocarbon. In other words, you are essentially getting shatter without any solvents.