Although inkjets were available in the 1980s, it was not until the 1990s that prices dropped enough to make them more affordable to the masses. Canon claims to have invented what it terms “bubble jet” technology in 1977, when a researcher accidentally touched an ink-filled syringe with a hot soldering iron. The heat forced a drop of ink out of the needle and so began the development of a new printing method. Inkjet printers have made rapid technological advances in recent years. The three-color printer has been around for several years and has succeeded in making color inkjet printing an affordable option; but as the superior four-color model became cheaper to produce, the swappable cartridge model was gradually phased out. Inkjet printers of high quality use six inks—photo magenta, magenta, photo cyan, cyan, yellow, and black. They come with six separate tank units. The latter design was intended for controlling cost in the event one color is depleted faster than the others due to high usage. This way, the unit used most frequently can be replaced for that color. They also have high picoliter count, a measurement used to determine how finely ink is sprayed onto the paper.
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