Hidden HP printer feature?

My HP PSC1210 inkjet was awfully low on black ink, couldn't much read the output... I took it out to see what number it was, OK, #56, unfortunately I couldn't find one anywhere, but I needed to print. Now.

So I whacked the cartridge on the desk a few times and re-installed it. This time a message flashes by, something about "reserve mode"... And the printouts are coming out great. How much "reserve" ink have I wasted over the years?

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