This versatile ultra rich dark dye based ink cartridge works great on just standard envelopes and other non-coated stock, it will bond to some of the slightly coated stock, but should be tested first, there is just too much different media out there. All of our cartridges carry a 6 month -100% money back guarantee on them, so its time to save money in this tough economic time. If you use this cartridge for inkjet addressing in high speed mail machines, and buy in larger volume, then call us... we can even give you better pricing .... We believe our inks are superior than any other remanufactured cartridge on the market, so if you are not satisfied with them, then call us and we will even pay for the shipping back to us... So you only have money to save... If you print on coated, glossy stock, then go to our HP-C8842A (Pigmented ink).. It is a Pigmented based Ink and works great on almost all coated stock..