A4-size photo printers tend to have six inks at most, while the A3+ and A2 printers on test have eight or more. For example, the Epson SureColor P900 runs on no less than 10 inks, including photo black, matte black, grey, light grey, cyan, light cyan, yellow, vivid magenta, vivid light magenta and violet. This enables a very wide ‘gamut’ or colour space for colour printing, as well as an excellent tonal range for black and white photo printing, with the promise of superb neutrality without any unwanted colour casts. Photo black and matte black are included for printing on glossy and matte media respectively. It’s only natural to think that a greater number of inks will result in higher running costs, but the flipside is that you’ll tend to…