Remanufactured for HP 12 Magenta Ink Cartridge (C4805A) – Business Inkjet 3000

HP 12 Magenta (C4805A) at a glance: a magenta ink cartridge. Remanufactured: a genuine HP 12 cartridge, cleaned, refilled and print-tested. Fits the HP Business Inkjet 3000 series. Backed by a 1-year 100% satisfaction guarantee; orders by 4 PM ET (Mon–Fri) ship the same day from California.

Key Facts

What's in the Box

• 1 × HP 12 Magenta (C4805A) remanufactured ink cartridge

Compatible Printers (3 models)

• HP Business Inkjet 3000 / 3000n / 3000dtn

Don't mix these up: HP 12 colors (55 ml) fit the Business Inkjet 3000 only, with HP 10 black. They are not HP 80 DesignJet ink, and they do not fit printers that take HP 11 colors.

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: C4805A, HP C4805A, HP 12 magenta, HP12 magenta, 12 magenta ink, Business Inkjet 3000 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 + HP 11 Cyan/Magenta/Yellow 4-Pack
• HP 10 Black Ink Cartridge (C4840A)
• HP 10 Black Ink Cartridge 69 ml (C4844A)
• HP 10 Cyan Ink Cartridge (C4841A)
• HP 10 Magenta Ink Cartridge (C4843A)
• HP 10 Yellow Ink Cartridge (C4842A)

Frequently Asked Questions

Can I replace one color at a time?

Yes. Each color is a separate cartridge, so replace only the one that is empty.

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 California, by USPS (2–5 business days). Expedited 1–2 day delivery is available at checkout, and shipping is free on orders over $50.