Toner and Ink:

Toner is a powder used in laser printers and photocopiers to form the printed text and images on the paper, in general with a toner cartridge. In its early form it was a mix of carbon powder and iron oxide. Then, to improve the quality of the printout, the carbon was melt-mixed with a polymer.[clarification needed] Toner particles are melted by the heat of the fuser, and are thus bonded to the paper.