A type of ink vehicle—the fluid carrier of the ink pigment—that dries by rapid absorption followed by oxidation and polymerization of the vehicle. Also known as quick-set inks, resin-oil vehicles are produced from a combination of solvents, oils, and resins. The solvent is rapidly absorbed by the substrate, leaving the resin and oil mixture to dry and harden by polymerization (the combining of smaller molecules to form a longer one, called a polymer). These inks dry quickly upon contact with paper, and are used in letterpress and offset printing. (See Vehicle.)
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