Decap is a known issue across the printing industry. When a nozzle has not been
exercised for a period of time, the water present in the ink near the nozzle might
evaporate thus leaving denser ink in the nozzle. Once the nozzle needs to fire a
drop, this drop will be more difficult to eject and cause image quality defects.
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INC, HP, "AUTOMATIC MICRO-RECIRCULATION CALIBRATION", Technical Disclosure Commons, (October 29, 2019)