Chemicals that change color with magnetism or electricity?

[calibmxin]

I was curious are there any chemicals that change color based on being exposed to magnetism or electricity?

[DFBatosee]

Electricity can cause a chemical reaction to occur therefore its quite common that color will change. For example electrolysis of CuCl2 solution will lead to red metal Cu at the cathode and green-yellow gas Cl2 at the anode.

I believe that some time ago I've heard about a substance which changes color when exposed to a magnetic filed but cannot recall what it was.

[firebird]

Youtube video of magnetochromatic microspheres changing color in a magnetic field: http://www.youtube.com/watch?v=LKsgzk5quZU

Read about magnetochromatic microspheres : http://pubs.acs.org/doi/abs/10.1021/ja903626h