The iPF500, iPF600, and iPF700 printers feature a new ink system that supports four dye color inks, and a 2-channel Matte black pigment ink. Doubling the matte black is used for maximum Black density and speed. When printing, four of the colors may be applied at the same time, since Matte black or black is automatically selected based on the media Type selected in the printer driver. Matte black will be used when printing on plain or matte media whereas the dye-based Black will be used when printed on coated or glossy paper. Automatic switching of black inks The printers will automatically switch between regular black and matte black At the time of printing. Simply choose the paper type and the printer will use the appropriate Black to optimize Print quality. The regular black ink produces high quality prints on photo glossy type media and the matte black ink exhibits high contrast prints with deep black on media such as fine art paper.