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any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing like glass;
..... Click the link for more information. obtained from the small mastic tree Pistacia lentiscus (of the sumacsumac
, common name for some members of the Anacardiaceae, a family of trees and shrubs native chiefly to the tropics but ranging into north temperate regions and characterized by resinous, often acrid, sap.
..... Click the link for more information. family), found chiefly in Mediterranean countries. When the bark of the tree is injured, the resin exudes in drops. It is transparent and pale yellow to green in color. Mastic is used chiefly in making varnish but is also used medicinally as an astringent and, with aniseed, to flavor a distilled liquor called mastic. The term mastic is also applied to certain caulking and adhesive compounds, especially those consisting of a mineral filler, a resinous binder (e.g., asphaltasphalt
, brownish-black substance used commonly in road making, roofing, and waterproofing. Chemically, it is a natural mixture of hydrocarbons. It varies in consistency from a solid to a semisolid, has great tenacity, melts when heated, and when ignited will burn with a smoky
..... Click the link for more information. ), and a volatile solvent.
(also mastic gum), a resin obtained by tapping the trunk of the mastic tree. In its hardened state it is in the form of yellowish droplets; it is very aromatic. Mastic contains essential oils (2-3 percent), resin acids (approximately 42 percent), masticic bitters (5 percent), and carbohydrate resenes (approximately 50 percent). Mastic is antiseptic owing to the presence of resin acids. It is used in the manufacture of varnishes, as a mouthwash, and as a binder in the preparation of pills and plasters.