Inks are liquid or powdered materials that are available in several colors and that are used to create the visual image on a substrate when writing, printing, and copying. Inks used by printers to add extra characteristics to their prints for special effects or functions. Heatset inks are characterized by their quick drying function.
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The Vegetable Ink Printing Act of 1994 requires that agencies use oil-based, heat-set inks containing a minimum 10% vegetable oil for lithographic printing services.