Epson T800900 UltraChrome PRO ink cartridge, Grey, 700 ml

When a printer has to mix grey from colour inks, the result can lean towards green or magenta. A dedicated grey ink lets it print neutral greys directly, so black and white photos and shadows look cleaner. Grey also smooths the transitions between dark and light areas without visible dots, which matters most in large prints viewed up close.

A 700 ml cartridge is sized for a large-format printer and lasts far longer than small office cartridges. Every swap is a short pause in production, so a bigger volume keeps the machine working for longer. How many sheets or square metres one cartridge delivers is not stated by the manufacturer, because consumption depends on image content and settings.

The manufacturer data lists the SureColor SC-P20000 and SureColor SC-P10000 as compatible printers. If a company runs both models, one spare cartridge covers either of them. No other models appear on the list, so for any other printer check the cartridge code in its manual before ordering.

Grey and black ink cartridges look much alike and are easy to confuse. This grey UltraChrome PRO cartridge is T800900, so compare it with the label on the old one. It comes as a single cartridge, so you replace only the grey while the other colours stay in the printer until they run out themselves.

SureColor SC-P20000 or SC-P10000 owners who print black and white photography, fine art, maps or technical drawings where a neutral grey matters. Also photo studios and print shops that want one spare cartridge for two printer models and no downtime in the middle of an order.