Our compatible fast dry black and "new" HP colored ink is dye based. This fast dry ink is housed within a original cartridge and are designed for tabletop or floor model, high-speed, high-volume mail addressing systems utilizing HP thermal inkjet technology when printing on porous and non coated stock. A dryer is suggested but not always necessary. Although it would be impossible to list all of the equipment that this ink works well on, a partial list might include mailing equipment such as: Astro Machine, Astrojet series, Bryce to 27K, some Buskro, DataTech, Hasler, Kirk Rudy, MCS 600, Neopost, Rena and Secap Jet 1. Extensive testing has proven that these compatible, HP C6195A, C6168A, ... fast dry ink cartridges offer superior performance on more types of paper with darker, sharper, and crisper mail addressing and barcode printing capabilities. As with any fast drying ink, to insure optimum performance, please clip your print heads when they are not in use and use a lint-free cloth and isopropyl alcohol 70% to clean your cartridge print heads. Use of paper towels, or a cotton cloth, is strictly prohibited as lint will clog print heads and all warranties will become void.