A one-page encyclopedia entry on dyeing from Knight's American Mechanical Dictionary. It defines organic and inorganic dyes, ranks fibers by how readily they take color, and distinguishes substantive from adjective dyes and mordants, with examples such as copperas and logwood. It also gives a historical sketch covering biblical references, Tyrian purple from murex, the discovery of Prussian blue, aniline, mauve and magenta, and ends with a note on dyeing black hats.