The genuine black canon cli 521bk ink cartridge works with selected canon inkjet printers to offer exceptional quality printing for photos this dye based black canon cli 521bk ink can replace the black pigment ink to enhance photos the more neutral black provided by cli 521 ink improves contrasts especially in black and white photos compatible with canon pixma ip3600 inkjet printer canon pixma ip4600 inkjet printer canon pixma ip4600x inkjet printer canon pixma ip4700 inkjet printer canon