Why does the K5400 use up colour ink when printing greyscale?

Please let me know why all K5400 printers use up the coloured inks when printing only grey scale, is there a way of stopping this waste of inks.?

There are a few possibilities:
The color drops are typically much smaller than the black drops so color is used for grayscale graphics unless "use black only" is checked in the driver. Depending on your operating system and driver this may be an option.
Black ink is generally not compatible with photo paper. If you are using photo paper only color ink will be used.
Color ink is used for servicing to keep the nozzles clear. See here for information on how ink is used.
Bob Headrick, HP Expert
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