Remanufactured for HP 10 Black Ink Cartridge (C4840A) – Standard Capacity | Castle Ink

HP 10 Black (C4840A) at a glance: a standard capacity black ink cartridge. Remanufactured: a genuine HP 10 cartridge, cleaned, refilled and print-tested. Fits the HP Business Inkjet 1000–3000, DesignJet 70–800, OfficeJet 9100 series and OfficeJet Pro K850. Backed by a 1-year 100% satisfaction guarantee; orders by 4 PM ET (Mon–Fri) ship the same day from Long Island, NY.

Key Facts

What's in the Box

• 1 × HP 10 Black (C4840A) remanufactured ink cartridge

Compatible Printers (25 models)

• HP Business Inkjet 1000 / 1100 / 1200 / 2200 / 2230 / 2250 / 2280 / 2300 / 2600 / 2800 / 3000
• HP Business Inkjet 2000c / 2500c
• HP Color Inkjet cp1700
• HP DesignJet 70 / 100 / 110 / 500 / 800 / 815mfp / 820mfp
• HP OfficeJet 9110 / 9120 / 9130
• HP OfficeJet Pro K850

Don't mix these up: C4840A is the standard HP 10 black (about 28 ml). C4844A is the 69 ml high-capacity HP 10 black for the same printers. The colors differ by model: HP 11, HP 10, HP 12 or HP 82.

Not sure? Look up your exact model on our Find Ink by Printer page, or contact us and we'll confirm the right cartridge for you.

Part Numbers & Also Known As

This cartridge replaces or is also searched for as: C4840A, HP C4840A, HP 10 black, HP10 black, 10 black ink, C4840, Business Inkjet 2800 black ink, DesignJet 500 black ink

Chips, Printer Messages & Installation

Installing: with the printer on, open the ink access door and wait for the carriage to stop. Remove the empty cartridge, unwrap the new one, pull off any protective tape without touching the copper contacts, and push it into the matching slot until it clicks. Close the door and let the printer finish its startup routine.

Ink level messages: the printer may show a "used" or "non-HP" cartridge notice, or an ink gauge that reads low or "?". Press OK to continue and judge by print quality, not the gauge.

Printheads are separate: these printers use replaceable printheads that last through many ink cartridges. If a color is missing after a new cartridge, run the printhead cleaning or alignment from the printer menu.

Still stuck? See our guide to fixing a cartridge that isn't recognized or contact us and we'll make it right.

Remanufactured vs. Compatible vs. Original

Original (OEM) cartridges are new from the printer brand and cost the most. Remanufactured cartridges, like this one, start as genuine original shells (including the original chip) that are cleaned, refilled with high-quality ink and print-tested, so they fit and communicate like the original at a fraction of the price. Compatible cartridges are built new by a third party with their own chip. Castle Ink sells remanufactured inkjet cartridges and compatible (newly manufactured) toner.

Other Options for the Same Printers

• HP 10 Black Ink Cartridge 69 ml (C4844A)
• HP 10 Black + HP 11 Cyan/Magenta/Yellow 4-Pack
• HP 10 Cyan Ink Cartridge (C4841A)
• HP 10 Magenta Ink Cartridge (C4843A)
• HP 10 Yellow Ink Cartridge (C4842A)

Frequently Asked Questions

Will this void my printer warranty?

No. Under the U.S. Magnuson-Moss Warranty Act, a manufacturer can't void your printer warranty just because you used a third-party or remanufactured supply. If a non-original supply directly caused damage, that specific repair might not be covered.

How long can I store it?

Store it sealed, at room temperature and out of direct sunlight, and use it within about 24 months for best results. Once opened, install it promptly.

When will my order ship?

Orders placed by 4 PM ET, Monday through Friday, ship the same business day from Long Island, NY, by USPS (2–5 business days). Expedited 1–2 day delivery is available at checkout, and shipping is free on orders over $50.