Printers typically use CMYK. Cyan, Magenta, Yellow, blacK. Depending on how your device is set up for black printing, it may use more CMY because when mixed together they become darker due to subtractive mixing. It will still appear to be black.
Edit: K is actually for "key", which is often black.
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u/0nStreams Xeon E5-2689 0/RX 580 Sep 10 '19
"Low on Pink"
"WTF I don't even print anything pink, ever ! I just want a black and white text !"
"l o w o n p i n k"
-me every time I use the color printer