Toner
Powder mixture in laser printers / From Wikipedia, the free encyclopedia
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Toner is a powder mixture used in laser printers and photocopiers to form the text and images on paper, in general through a toner cartridge. Mostly granulated plastic, early mixtures added only carbon powder and iron oxide; now there are mixtures that contain polypropylene, fumed silica, and various minerals for triboelectrification.[1] Toner using plant-derived plastic also exists as an alternative to petroleum plastic.[2] Toner particles are melted by the heat of the fuser, and are thus bonded to the paper.
In earlier photocopiers, this low-cost carbon toner was poured by the user from a bottle into a reservoir in the machine[citation needed]. Later copiers, and laser printers from the first 1984 Hewlett-Packard LaserJet,[3] feed directly from a sealed toner cartridge.
Laser toner cartridges for use in color copiers and printers come in sets of cyan, magenta, yellow and black (CMYK), allowing a very large color gamut to be generated by mixing.