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. Refers to the substance obtained after distilling pine resin. It is a solid, transparent material that is insoluble in water but soluble in alcohol. It is hard and brittle, with a pale yellow or brown color. It serves as an industrial raw material for producing paints, soap, paper, matches, etc.

Resin is oil that flows from within the trunk of pine trees, melts into a watery state at high temperatures, and turns into a blocky solid after drying (with no fixed melting point). It has a burnt yellow or deep red color and is an important chemical raw material. In daily life, it is primarily used as a flux during circuit board soldering. In musical instruments, resin is applied to the strings of erhu, violin, morin khuur, and other string instruments on the bow hairs to increase the friction between the bow hairs and the strings.