The HP Deskjet 6840dt ink cartridges from Carrot Ink are new compatible printer supplies that are guaranteed to meet or exceed the print quality of the OEM (Original Equipment Manufacturer) HP printer cartridges. With Carrot's HP Deskjet 6840dt supplies you'll save a bunch of money and get just as good of performance. Our HP Deskjet 6840dt inkjet replacements come with a one year satisfaction guarantee. Federal Law protects you when using compatible supplies for the HP Deskjet 6840dt and does not void your printer's warranty. OEM Deskjet 6840dt ink cartridges and supplies finally have real competition.