A resin derived from the esterification of rosin, a natural resin extracted from pine trees, with glycerol or other polyhydric alcohols. This process modifies the rosin, improving its properties such as solubility, hardness, and adhesion. The resultant product is a hard, brittle, pale yellow to amber-colored solid.
The substance exhibits valued characteristics, contributing significantly to various industries. Its adhesive qualities make it useful in adhesives and sealants. It improves the gloss and durability of printing inks. Historically, the material provided an alternative to shellac in varnishes, allowing for more flexible and less brittle coatings. Its inclusion in chewing gum offers enhanced texture and binding.