Contains DURABrite Ultra Ink which is designed for business printing and is quick drying long lasting and smudge resistant With its resin coated pigment particles that adhere to the surface of the paper as opposed to sinking into it as dye-based inks do DURABrite Ultra Ink produces fast dying laser-like text and graphics on multiple paper types and grades DURABrite Ultra Ink dries instantly making ideal for use in environments where duplex printing is regularly used or set as standard Its surface adhesion means that there is less 'bleed through' on the page and because it dries instantly there is no risk of smudging when printing on both sides of the paper DURABrite Ultra ink is water and highlighter resistant