Dell Photo All-in-One Printer 942 Owner's Manual page 61

If your black ink cartridge is out of ink, you can choose to print black from the color ink cartridge
by selecting Complete-A-Print before clicking the Continue Printing button. If you select
Complete-A-Print and click Continue Printing, Process Black will be used for all black printing
until the black cartridge is replaced or the option is deselected from Maintenance tab in the Dell
Printer Solution Center. The Reserve Tank dialog will not be displayed again until after the low
ink cartridge has been replaced. The Complete-A-Print checkbox is automatically reset when a
new or different cartridge is installed.
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Understanding the Printer Software