The ability to switch blacks automatically actually first appeared in the Stylus Pro 3800, a scaled-down 17-inch model, and in the massive 64-inch SP11880. Those models use an inkset called Ultrachrome K3 with Vivid Magenta, which required eight and nine channels respectively. But the two newest pro models use an inkset dubbed Ultrachrome HDR, for high dynamic range, which features new orange and green inks, for a total of ten channels. (There's an eleventh cartridge slot for the black not in use.) The green and orange inks are designed to further expand the color gamut of prints, and on paper (so to speak) they do. Whether the overall improvement is visible or not, the green and orange inks can make a real difference in the rendition of skin tones because both contain a measure of yellow, an inkjet nemesis.