What Ink Does the HP Latex 315 Use?

Quick answer: The HP Latex 315 uses seven HP 831 775 ml latex cartridges — Black, Cyan, Magenta, Yellow, Light Cyan and Light Magenta inks plus the HP 831 Latex Optimizer. The same cartridges fit the HP Latex 310. Castle Ink carries all seven remanufactured: HP 831 Black (CZ682A), HP 831 Cyan (CZ683A), HP 831 Magenta (CZ684A), HP 831 Yellow (CZ685A), HP 831 Light Cyan (CZ686A), HP 831 Light Magenta (CZ687A) and the HP 831 Latex Optimizer (CZ706A).

HP Latex 315 Ink Cartridges at a Glance

Every one of the seven slots must hold a cartridge for the printer to run. The Latex Optimizer is not optional — it is a clear fluid that fixes the colored inks to the media surface, so prints come out sharp on vinyl, banner and other non-porous materials. It empties at a similar rate to the colors, so keep a spare.

The Latex 315 is HP's 54-inch entry latex printer for signs, banners, decals and wall graphics. It replaced the Latex 310 and uses the same ink, with the same dry-to-touch output that makes latex popular with small sign shops.

HP 831 775 ml cartridges fit the whole HP Latex 300 series — the Latex 310, 315, 330, 335, 360 and 365 — plus the Latex 560, Latex 370 and Latex 570. See our HP Latex 335 and HP Latex 365 guides if you run more than one. The larger Latex 370 and Latex 570 can also run HP 871 3-liter cartridges, but they accept these same HP 831 775 ml cartridges too.

Other HP 831 Supplies

The cartridges are only part of the system. The HP Latex 315 also uses four HP 831 printheads — Cyan/Black (CZ677A), Yellow/Magenta (CZ678A), Light Cyan/Light Magenta (CZ679A) and Optimizer (CZ680A) — and an HP 831 maintenance cartridge (CZ681A). These are long-life parts you replace far less often than ink.

Save on HP 831 Latex Ink

Castle Ink's U.S.-remanufactured HP 831 cartridges are built from original HP 831 775 ml cartridges and refilled to OEM ink level, color and performance. Order just the color you need — HP 831 Black (CZ682A), HP 831 Cyan (CZ683A), HP 831 Magenta (CZ684A), HP 831 Yellow (CZ685A), HP 831 Light Cyan (CZ686A), HP 831 Light Magenta (CZ687A) and the HP 831 Latex Optimizer (CZ706A). Shipping is free on orders over $50, and the rest of our large-format ink is in the Wide Format Cartridges collection.

How to Replace Ink in the HP Latex 315

1. Wait for the front panel to report an empty cartridge, or open the ink menu and choose to replace one.
2. Open the ink cartridge drawer or cover for the color you are replacing.
3. Pull the empty cartridge straight out.
4. Shake the new cartridge gently a few times before installing it — ink settles while a cartridge sits on the shelf.
5. Push the new cartridge into the slot that matches its color label until it locks, then close the cover.
6. Check the front panel to confirm the cartridge is recognized before you start the next job.

Troubleshooting Tips

Cartridge not recognized or "non-HP cartridge" message: Reseat the cartridge firmly. A notice that a cartridge is not original HP is normal with remanufactured ink — accept it on the front panel to continue.

Prints smear or stay tacky: Check the Optimizer cartridge first, then confirm the curing temperature and media preset match the material. Latex ink needs the Optimizer and correct curing to set properly.

Banding or missing colors: Run the printhead cleaning and alignment routines from the front panel. If a color is still missing, check the matching HP 831 printhead and the maintenance cartridge status.

Official HP Latex 315 Resources

• HP Customer Support — Latex printers

Bottom Line

The HP Latex 315 runs on seven HP 831 775 ml cartridges, including the Latex Optimizer. Keep a spare Black and Optimizer on hand, and replace only the color that runs out.

Written and reviewed by William Elward — Founder of Castle Ink, 20+ years in the printer & imaging supplies industry. Last updated October 2026.

Frequently Asked Questions

Does the HP Latex 315 use HP 831 or HP 871?
HP 831 775 ml cartridges. HP 871 3-liter cartridges are an extra option only on the Latex 370 and 570, which also accept HP 831.

Is the Latex 315 ink the same as the Latex 310?
Yes. Both take the same seven HP 831 775 ml cartridges.

Can I print without the Latex Optimizer?
No. All seven cartridges, including the Optimizer, must be installed.

Do the Latex 310, 315, 330, 335, 360 and 365 share ink?
Yes. They all take the same HP 831 775 ml cartridges.

Does using remanufactured cartridges void my warranty?
No. Under the U.S. Magnuson-Moss Warranty Act, a manufacturer cannot void your printer warranty only because you used third-party cartridges. Damage proven to be caused by a specific cartridge would not be covered, but the rest of the warranty still applies. Service contracts (HP Care Packs) can carry their own terms, so check yours.

Shop Wide-Format Ink at Castle Ink

Browse every large-format cartridge we carry in our Wide Format Cartridges collection, find the right ink for any other printer on the Find Ink by Printer page, or work through a fault at our printer troubleshooting center.

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See also: printer says ink cartridge not recognized | faded or streaky prints | printer printing the wrong colors