HP Officejet 6600 e-All-in-One Printer - H711a H711g - Manual (Page 167)

NOTE: Ink level warnings and indicators provide estimates for planning purposes only.
When you receive a low-ink warning message, consider having a replacement cartridge
available to avoid possible printing delays. You do not need to replace cartridges until
prompted to do so.
HP media
To order media such as HP Premium Paper, go to www.hp.com.
HP recommends plain papers with the ColorLok logo for printing
and copying of everyday documents. All papers with the
ColorLok logo are independently tested to meet high standards
of reliability and print quality, and produce documents with crisp,
vivid color, bolder blacks, and that dry faster than ordinary plain
papers. Look for papers with the ColorLok logo in a variety of
weights and sizes from major paper manufacturers.
Supplies 163