All colors used in this printer are pigment inks. A Gloss Optimizer channel is added to equalize the differences in gloss level between dark and lighter areas. This results in a more even sheen.
Because of the way an inkjet printer works, a small quantity of matte black color ink is still used during maintenance functions even if you print mainly with photoblack.
The products in this grouping are all compatible with Epson Stylus Photo
R1900. The ARC chips on this can take advantage of the manual ARC resetter.