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Glycerol Ester of Wood Rosin
"Ester gum" * The natural product rosin is a complex mixture of mutually soluble organic compounds. There are three general methods of producing rosins commercially, these methods (and their products) being: solvent extraction of pure stump wood (wood rosin); tapping of gum from the living tree (gum rosin); separation from tall oil (tall oil rosin). The three rosins, freed of extraneous impurities and refined, differ somewhat quantitatively and in colour but all three may be glycinerated to produce the glycerol ester.