Pass a lot of high voltage DC current onto deionised water and you get remarkable colourful patterns at the water surface.

                          
 As the deionised water became conductive enough to sustain a higher current , the faint and feeble spark increased to a power arc to water of about 2 kV DC eventually to the point of making the wire red hot. The first 3 photos all show interesting variation in the surface effects. The green glow is the copper from a hotter arc.

A spark playing over a magnet submerged in deionised water.

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Photo Date: 2005, 2006, 2007