Gum mastic

Msstix, m. mastic (the resin), gum mastic, -braontwein, m. mastic (the liquor), -firnis, m. mastic varnish, -harz, n. mastic (resin). -Idtt, m. mastic (cement), -lack, m. mastic varnish, -losimg,/. mastic solution, mastizieren, v.t. masticate. 

E. Seoane, Further crystalline constituents of gum mastic, Journal of the Chemical Society, 4158 4159 (1956). 

P. Dietemann, M. Kalin, R. White, C. Sudano, R. Knochenmuss, and R. Zenobi, Chios Gum Mastic Freshly Harvested vs. Commercial Resin and its Implications to Aging of Varnishes, Z. Kunsttechnol. Konserv., 19, 119 130 (2005). 

In some cases adsorption of the ion resulting in precipitation may promote apparent hydrolysis, as instanced in the case of Fuller s earth (p. 187), thus if gum mastic suspension in water, a negative colloid, be floated on a solution of copper sulphate the copper ions will be adsorbed and the solution will be left feebly acid—a phenomenon noted by Spring (Bee. d. Trav. Ghim. d. Pavs-Bas, ly. 215, 1900). 

Example 1. A dilute solution of gum mastic in alcohol is poured slowly into a large volume of water. A saturated solution of sulfur in alcohol is poured into water. 

Lithographic Printing Ink.—The composition of lithographic writing ink has boon already given. That which is employed to taka impressions on paper from engraved plates, with a view to their transference to the stona, may be composed as follows -—Tallow, wax, and soap, of each four ounces shellaa, throe ounces gum-mastic, two and a half ounces black pitch, one ounce and a half to which add lamp-black to color. 

When the printed pattern is applied to the ware above tlie glaze, the mordant receives a larger proportion of gum mastic but where enameling colors are used for the muffle, a sine is applied to the surface of the glaze, composed of spirits of turpentine, with a small portion of gum mastic dissolved in it sometimos rosin and sugar of load being added.. 

Compounds such as (69) (from gum mastic, Pistacia len-tiscus, Anacardiaceae) and (70) (Fig. 23.24) may be regarded as products of trapping of a cationic intermediate of the cyclization of squalene 2,3-epoxide (2) to tetracyclic and pentacyclic triterpenes (Harrison, 1988). 

Bookbinders varnish n. Rapid drying varnish based on shellac, sandarac or gum mastic, or mixtures of these resins. Kirk-Othmer encyclopedia of chemical technology pigments-powders. John Wiley and Sons, New York, 1996. 

Gum mastic n. A natural resin used for picture varnish to protect oil paintings, water colors and the like. 

From the earliest recorded times, man has utilized natural polymers. Such materials as asphalt, amber, and gum mastic are referred to in the written records of very early civilizations and, later, of the ancient Greeks and Romans. The pattern of use followed the classic human approach, namely, putting something to work without understanding its fundamental nature. Unfortunately, this failure to study delayed the effective utilization of synthetic polymers until the twentieth century. 

Stoffubergang, Massentlbergang, Stofftransport, Massentransport, Massentransfer mass transfer coefficient Stoffubergang szahl, Stofftransportkoeffizient, Massentransferkoeffizient mastic/gum mastic/... 

GUM MASTIC is a yellowish or greenish transparent resin obtained by incision of a type of balsam tree, Pistacia lentiscus, grown in the Mediterranean region. It is soluble in ether or acetone, almost entirely soluble in alcohol, and partly in oil of turpentine. About 2% of volatile oil is present. It is sold in cases for use in medicine, dental cements, plasters, varnishes, lacquers, adhesives, chewing gum, and incense. 

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