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Do inkjet printers use color ink when printing black and white documents? If so, why?

I almost never print color documents or photos, yet it seems like my printer's color ink runs out at least as quickly as the black ink. It's like the printer is using the color ink whether or not the document is in color.

4 Answers

Michael Nickerson, 35 years at HP. 24 years in all aspects of LaserJet printers.

Written 29 Sep 2016

If the print is pure black and white, and the printer has a dedicated black cartridge, it should just use the black ink. I can think of two things that might use more color ink than you might expect:

First, every time the inkjet gets ready to print, it will prime and clean the printheads. It does that to ensure they aren't clogged and ink will flow freely as needed. It will do this on all colors, even if you only print black. This uses some ink.

Second, if you are printing monochrome gray scale images (say a black and white photo on the page), the printer might use color inks in order to get more shades of gray. Higher end photo printers have black and gray ink so they can print high quality black and white photos without using the color cartridges. They often have light and dark cyan and magenta inks also for smoother color blending.

3.9k Views · View Upvotes · Answer requested by Shery Castillo