An ink is a liquid containing various pigments and/or dyes used for coloring a surface to produce an image, text, or design. Ink is used for drawing and/or writing with a pen ...
http://en.wikipedia.org/wiki/Ink

noun . 1. a fluid or viscous substance used for writing or printing. 2. a dark, protective fluid ejected by the cuttlefish and other cephalopods.
http://dictionary.reference.com/browse/Ink

Ink is a weekly Black newspaper continuing the tradition of the African American press in Fort Wayne and Northeast Indiana
http://www.inknewsonline.com/

An ink cartridge is a replaceable component of an ink jet printer that contains the ink (and sometimes the print-head itself) that is spread on paper during printing.
http://en.wikipedia.org/wiki/Ink_cartridge

I have been SUPER DUPER pleased with my many experiences with Clickinks! I can order with ease knowing that the compatible ink is cheaper and will always work in my fax and printer
http://www.clickinks.com/