Title: Black Ink Anyone?
Review: There are so many times where the actual ink, can be the difference between a good copy, and a not-so-good copy on paper. With HP black ink cartridge #21, it is very convient, and easy to setup into your HP deskjet 3930 series printer. This cartridge is very inexpensive, and affordable for HP printers. I think of it as a must for your HP printers. While there are cartridges that are difficult to open, and install into your printers, this one installs in a snap. I really recommend this for my new HP printer, and so will you if you own a HP printer for this ink as well.Price: BConvience: B+Overall: B 1/2+
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