HP printers use a little bit of color ink, even if you only print in black. This is done by HP inorder to keep the color printhead jets clear.
You can select "greyscale only" by clicking on [Preferences] and going to the advanced screen. Choose "use greyscale only".
When you print a color page, the printer will only print black/grey. However ... it will still use a tiny bit of each color ink.
Oh, yeah .. they make lots of money, too.
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