I saw quite a lot of problems on the internet with these cartridges - First I had a problem - here is the solution - for HP8600 Officejet pro if your printer not working - Do not mix these cartridges with original HP cartridges. Replace all cartridges at once - works great - print quality is really good. I have way more ink than when I bought HP cartridges. I'm very happy - I have so much ink I don't have to worry about throwing away unused HP cartridges.
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