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Bituminous material in oil of turpentine; used in photomechanical work because of its ability to be rendered insoluble in light.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. Natural asphalt.
2. In painting, asphalt from residues of crude mineral oil.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.