The genuine high capacity black Canon PGI-550PGBKXL ink cartridge, alternatively known as Canon 6431B001 ink, contains twice the amount of ink that a regular cartridge has, making it a cost-effective solution for small offices that would like to print more pages and pictures. The black Canon PGI-550PGBKXL high capacity ink is made with LUCIA formulation, which makes it more reliable for monochrome documents printed in true black. This pigmented ink system is also reliable for sharper lines and better image quality in general. Print outs are also smudge-proof with the PGI-550PGBKXL pigment black ink cartridge even when printing on speciality paper.