Dell 924 - Photo All-In-One Inkjet Owner's Manual page 46

If your black ink cartridge is out of ink, you can choose to print black from the color ink cartridge
(Process Black) by selecting Complete-A-Print before clicking the Continue Printing button. If
you select Complete-A-Print, and click Continue Printing, Process Black is used for all black
printing until the black cartridge is replaced, or the option is cleared from More Options,
located on the Advanced tab of the Printing Preferences. The Reserve Tank dialog does not
display again until after the low ink cartridge has been replaced. The Complete-A-Print check
box is automatically reset when a new or different cartridge is installed.
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Understanding the Software