[1] Comparing 300-ml HP 727 DesignJet Ink Cartridges to 130-ml HP 727 DesignJet Ink Cartridges.
[2] Visit http://www.hp.com/recycle to see how to participate and for HP Planet Partners program availability; program may not be available in your area. Where this program is not available, consult the Material Safety Data Sheet (MSDS) available at http://www.hp.com/go/ecodata to determine appropriate disposal.
[3] True neutral grays produced by printers compatible with the HP Three-black ink set.