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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.

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.

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.

Electric razors tend to shave hair away faster than manual razors. They are more versatile in that they can be used to accurately shave facial hair, beards, mustaches, and sideburns. Shaving with an electric razor could reduce nicks, cuts and ingrown hairs.

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.