The HP Black 4500 Pigment Bulk Ink System is engineered to deliver optimal image quality on a broad set of porous substrates. The high-capacity 350 ml bulk ink cartridge reduces operator intervention on long print runs. This advanced, robust solution for high-volume printing offers end users: - A choice of printhead and ink-cartridge configurations to achieve nearly any print swath - Sharp, crisp output at high speeds without smearing or transfer - Easy-to-replace printheads and bulk ink cartridges that can be hot swapped independently This ink is water-based, so it does not require harsh chemical cleaners, flushing liquids, venting hoods, or specially trained operators.Compatible Printers: HP Thermal InkJet 2.5