Hp 21 Black Ink Cartridge By Veronica Acosta on Oct 22, 2007 - Updated Oct 15, 2011

Okay so I am not the most Knowledgeable person about ink cartridges, so when I went to purchase ink for my HP printer, they had a little book on display to show which ink cartridges are compatible with my printer, so I looked it up, and found mine right away. It said the HP 21 black ink. So I bought it. When I got home, it went in perfectly fine. And it also printed just fine. Okay maybe one month later, my printer started acting up, and pretty much quit printing anything that needed black ink. So I looked and sure enough, the black ink was OUT. I don't use my printer that much for it to be out already I thought. I went online, and researched the HP 21 black ink cartridge and it has tons of negative reviews, that other people have the same problem. It first makes your printer act up, and then your in need of a replacement, right away. So next time, learn from me, do your research before you go. It will save you some money.