Toner is the powdered coloring material used by a laser printer. A laser prepares a roller so toner adheres only to selected areas; heat then bonds it to paper. section 1.2
Under a microscope, toner particles look different from ink. The printed page may contain millions of dots, although documents are usually stored as structured text, typefaces, lines, and curves instead. section 1.2
A word under magnification
Microscope images compare laser-printed words at 1pt, 2pt, 4pt, 6pt, and 8pt, including a 400× view of the 2pt word. section 1.2
Figure 1.5 Microscope pictures of laser-printed text
Inspecting laser-printed text makes the physical behavior of toner visible at different magnifications. section 1.2
