Chemically, resins consist of complex mixtures of organic (resin) acids and alcohols, which are generally aromatic in nature, and inert substances (known as resenes), together with extraneous fatty, mineral, or other materials. Gum resins contain carbohydrate gums, while oleoresins are mixtures of resins and volatile oils. The non-volatile residue of conifer resins is called ROSIN , which is the most important resin used in the manufacture of paper. Other more-or-less familiar resins include copal and dammar, which are natural resins used in the manufacture of varnish, accroides, amber, elemi, ester gum, manila copal, mastic, sandarac, and shellac. See also: SYNTHETIC RESINS .
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