Japanese tung oil
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Related to Japanese tung oil: tung tree
A drying oil which oxidizes very rapidly, at almost twice the rate of linseed oil; forms a hard dry film when used in paints and varnishes; although “China wood oil” and “wood oil” sometimes are used as synonyms, tung oil never is extracted from wood.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.