* Remanufactured HP 45 Ink Cartridge with Invisible Ink or Black Light Ink * This uv invisible blacklight ink allows mail addressing companies to produce custom coded documents only visible under black light, but it is not intended as an alternative to barcoding ink, as Merlin equipment will not read this ink * Ideal for pharmaceutical coding, medical coding or political coding, but this uv invisible ink cartridge may, additionally, be used in many HP deskjet printers to create custom party invitations * Designed for use on mail addressing systems with HP thermal inkjet technology including: Accufast, Astrojet II Plus, Astrojet III, Astrojet III Plus, Bryce to 27k, Buskro, Datatech, MCS, Nutec, Pitney Bowes, Prism, Secap, Surefeed, Videojet and Kirk Rudy W'inkjets * As with any fast drying ink, to insure optimum performance, please reclip your printheads when they are not in use and use a lint-free cloth and alcohol to clean your cartridge printheads. Use of paper towels, or a cotton cloth, is strictly prohibited as lint will clog the printheads and all warranties will become void * We offer competitive pricing on this reliable and compatible HP ink cartridge, so please bookmark this page as a reminder to purchase printing ink from our online store. We value you as a customer and we want to be your one stop to shop for invisible ink * Compatible, 42ml, HP q7485a cartridge * One year warranty * Made in america * Free US Priority Mail or UPS Ground from CA * Upcharges will apply if faster freight is required * US SALES ONLY - IN STOCK