The HP 70 C9459A is a 130 ml DesignJet cartridge containing gloss enhancer for photo printing. It is intended for use with gloss and semi-gloss photo media, where it helps create a more uniform sheen from highlights through shadows.
HP says the gloss enhancer was designed and tested with HP Photo Inks, the printer, and HP gloss and semi-gloss media. This coordinated use supports consistent printing across the image, including areas with different tones. The cartridge is identified as gloss enhancer rather than a conventional colour ink.