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Open the printer and allow the ink carrier to move to the center of the machine. Look at the product number printed on each cartridge. If you don't see a number on the top of a cartridge, remove it from the printer. Look for the number printed on a sticker on the side of the cartridge.

Standard rollerball ink is made from particles of carbon black, a pigment substance. These particles are segregated from each other by a polymer that is adsorbed onto the surface of the carbon black particles. Finally, a solvent is applied so that the ink will flow.

Ink costs per ounce vary dramatically: from the $75-per-ounce figure down to about $13 per ounce. And as with ink usage for maintenance, there's as much variation within brand, according to the cartridge used, as from one manufacturer to another.

There are a number of best practices you can use to help your research efforts:1) Search the Internet Search for wholesalers by product to help you pinpoint local suppliers (this will bring up nationwide suppliers), then add your zip code to the search so that your results are localized. You can also search YellowPages.com and online associations,

Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper, plastic, or other substrates. Inkjet printers are the most commonly used type of printer, and range from small inexpensive consumer models to expensive professional machines.