Journal Journal: nanotechnology
University of California, Riverside nanotechnologists have succeeded in controlling the color of very small particles of iron oxide suspended in water simply by applying an external magnetic field to the solution. By varying the strength of the field the particles change color possibly leading to better displays.
http://www.nanowerk.com/news/newsid=2166.php
http://www.nanowerk.com/news/newsid=2166.php