When should I use the optional Matte Black ink cartridge?

• You'll get the best results when printing black text or black & white images in color mode using the optional Matte Black ink cartridge. The Photo Black and optional Matte Black ink cartridges are compatible with different paper types and Print Quality settings, as described below.
  
  Highest compatible Print Quality

  Highest compatible print quality for this paper type	dpi with Photo Black	dpi with Matte Black
  Plain paper	720 dpi	720 dpi
  EPSON Premium Bright White Ink Jet Paper	720 dpi	720 dpi
  EPSON Enhanced Matte Ink Jet Paper	2880 dpi	2880 dpi
  EPSON Premium Semigloss Photo Paper	2880 dpi	* Not compatible
  EPSON Premium Luster Photo Paper	2880 dpi	* Not compatible
  EPSON Watercolor Paper - Radiant White	2880 dpi	2880 dpi
  EPSON Premium Glossy Photo Paper	2880 dpi	* Not compatible
  EPSON Velvet Fine Art Paper	2880 dpi	2880 dpi

  * The Matte Black ink cartridge is not compatible with these paper types. You can't select these as the Media Type setting in your printer software.