InkOwl Pigment Refill Kit for HP 932, 933, 950, 951 cartridges (4x120mL) This pigment ink is of an extremely high quality and matches HP specifications in all aspects from color reproduction to viscosity and pigment diameter. This ink will offer vivid, perfectly matched colors, and yield prints resistant to fading from UV exposure, smudging, and water. This ink is equivalent for all intents and purposes to the original HP formulation. The ink works on all papers, including glossy. NOTE about refilling the HP 932/933/950/951 cartridges: It is recommended that you keep as many empties on hand as you can. This is because sometimes, in rare cases, the printer will display an "Ink Cartridge Depleted" error if it detected that there was physically no ink inside. The only way to get the printer to work again after receiving this error is to install a different cartridge. After that second cartridge is installed, the first cartridge can be reinstalled without errors. However, in the vast majority of cases, refilled cartridges are accepted by the printer without issue although the ink level displayed by the printer will be inaccurate.