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HP 81 Dye Ink Cartridges are designed to work with HP 81 Dye Printheads as part of a complete modular ink system. Six specially formulated, dye-based ink colors deliver the smoothest color transitions and wide color gamuts. These high-capacity 680ml ink cartridges are ideal for overnight or unattended production printing. Built-in smart chips constantly monitor ink cartridge levels and alert you when it's time to replace.