Interesting that you mention this...a friend I'm doing some consulting for has a Deskjet 612C. He recently refilled his black and color cartridges at Inkjet Canada. The black works fine, but the color had BIG problems with the yellow not coming out at all. After a long spiel from the tech there (and a sales pitch trying to get us to trade the printer in to them for a color cartridge on a 932 *grrr*), we returned the color cartridge for money and bought an HP color cartridge. Apparently, HP has some type of system that sabotages the yellow color on these cartridges. I wish I could find cheap RELIABLE color refill cartridges for the things up here in Canada.