This Page Will Give You A Brief Overview Of Refilling The HP 51641A, C1823A, C6578 Color Cartridges

All that is necessary to refill these cartridges is to push the vent hole plugs (3) into the cartridge. It is not necessary to cover the holes after refilling, but we suggest that you cover them with a piece of tape and put a pinhole in it. That will give you about the same venting as the original plug. The large capacity cartridges take about 10cc per color. The order is Yellow-Magenta-Cyan. These cartridges refill much better if you top them off regularly and don't let them run completely dry. Complete instructions included in the kit!

Thats it! Always check to make sure that the cartridge does not leak before installing! Overfilling will cause ink to seep across the printhead mixing the colors up. This will give you a "muddy" color. Normally the problem will clear up after printing a few pages