Epson Stylus Pro 7890 Series Reference Manual page 33

Specifications are subject to change without notice.
Cartridge yields vary considerably for reasons including images printed, print settings, temperature and humidity. Yields may be lower when
printing infrequently or predominantly with one ink color. A variable amount of ink remains in the cartridge after the "replace cartridge"
signal. Part of the ink from the first cartridges is used for priming the printer. Ink is used for both printing and print head maintenance.
All inks are used from both black and color printing.
For more information about cartridges see www.epson.com/cartridgeinfo
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