How to find the correct color chamber before adding ink. Use a wooden tooth pick and push it into the hole under the label. Now remove the tooth pick and you should see the color.

When you inject ink into a cartridge it upsets the internal pressures in the cartridge. When the cartridge is full, let it set on some newspapers or in a plastic container for 15 minutes or more before putting it back into your printer. This will give the cartridge time to stabilize internally. The excess ink will drain off and the chambers inside will reach equilibrium. Wipe off the print head with a damp paper towel. Never put a cartridge into a zip lock bag for storage this will cause cross contaminations of the colors

The number one refilling problem for HEWLETT PACKARD printers is a dried out cartridge. The ink will dry and clog the micro holes at the outlet of the print head. When refilled, this will present itself as streaked or banded output. If you attempt to refill old empty cartridges that you have had in your desk drawer for a few days or longer you must use our snap and vac. This will purge any ink or air that is blocking the printhead.