Genuine OEM HP DesignJet Z3100 24 In. Ink and Supplies
The 24-inch DesignJet Z3100 has separate HP 70 gray and light gray inks, as well as separate magenta and light magenta. The lighter names don't describe smaller cartridges. Each ink has its own labeled position, so choose the exact color that needs a top-up.
Toner Buzz carries genuine HP 70 individual inks and paired printheads for this printer, including separate red, green, blue, and gloss enhancer supplies. The gray/gloss enhancer printhead handles those supplies on paper; it isn't a gray ink cartridge or a bottle of gloss enhancer.