Review on HP 935 Ink Cartridges for HP OfficeJet 6800 & Pro 6230 - Cyan Magenta Yellow - C2P20AN C2P21A C2P22AN by Josh Allen

If you are buying the HP 935 color set for the second time, the cyan cartridge does not work with the HP OfficeJet Pro 6835. Last year Revain replaced the cartridge pack; This time it was past the return period so Revain support put me in contact with HP support. After a long time waiting and gathering information, they will ship a new cyan cartridge within 4-5 days. (Thanks Merci). Apparently HP has problems with the quality of the cyan cartridges, since you can search the internet for cyan cartridge printing problems. I think I should have installed them within the 30 day return period but you should be able to count on a quality product from HP for the price of the ink. Maybe next time Epson or Brothers or another printer. Or try a refilled cartridge from another brand - take the chance anyway! Hope this helps someone.