Hello, Lisa -
You can choose to print in black only. However, the black print will use not only the ink from the black ink cartridge but it will also draw from the 3 other color ink cartridges.
Bottom line: You will need sufficient ink in all ink cartridges even to print in black only.
Please read your HP 6700 user's manual, starting on page 74 of the manual.
In case you do not have the user's manual for your printer, this is the link so you can download and save the PDF (Adobe Acrobat Reader software, free) version of the manual:
http://h10032.www1.hp.com/ctg/Manual/c03227497
Best wishes.
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