I wish I could be of more help, but I quit using my HP Photosmart 1000, when I bought a Canon i950 about 5 years ago. But, to answer your question - yes, I used to refill both the black and the 3-color cartridge for the HP (as I recall) so I know it can be done. Refilling wasn't all that difficult, but the printer didn't meet my needs on color photos, so I switched.