Hewlett Packard printers use a pigmented black ink. Our Process Cleans and rinses errant particles right out of the system. Then the cartridge is refilled through the print head - the same way the ink came out. No more opening of the cartridge - reducing the possibility of adding print head blocking particles. The Final Adjustment of pressure in the cartridge is done in a quick and efficient manner.
Leaky cartridges are a thing of the past .
Simply look at your HP black cartridge.