A type of ink vehicle—the fluid carrier of the ink pigment—that dries by absorption of the vehicle into the surface of the substrate, rather than by evaporation or oxidation. Non-drying oils are composed primarily of petroleum and rosin oils that do not dry upon exposure to the atmosphere, but penetrate the surface of the paper, leaving the hardened pigment on the surface. To the vehicle are added various resins to provide the necessary viscosity or tack. Non-drying oil vehicles are used in inks that are printed on highly absorbent paper, such as newsprint. (See Vehicle.)
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