One of the impressive things about the Epson P600 is its handling of black and white images. There are 4 different black links inside the printer. Three of these inks work in combination to print over a wider dynamic range than just using one ink. There are two different blacks that are selectable depending on the paper you are using (1 for photo-gloss and 1 for matte finish). Note that switching between the blacks will use up a little bit of ink, but Epson has minimized this considerably.
In the excellent series of video blogs, “The Art of Photography” by Ted Forbes, Ted talks about black and white photography printing using the Epson P600.
From the manufacturer: The all-new Epson SureColor P600 features Epson UltraChrome HD Ink for extraordinary exhibition-quality prints. With unprecedented black density and breakthrough Resin Encapsulation Technology, the P600 delivers the richest blacks with an incredible level of sharpness. Three-level Black Ink technology delivers smooth tonal transitions for the finest black-and-white prints. High-capacity, individual ink cartridges improve your productivity with fewer user interventions. Advanced media handling allows you to easily print with a wide variety of fine art and roll papers. Create borderless 13″ x 19″ prints and panoramas over 10 feet long. Whatever you print, the SureColor P600 delivers such dramatically bold images, it sets a groundbreaking new benchmark in photographic quality.