One of the best ways to illustrate electrolysis is using a device constructed from two pencils and a 9-volt battery. A remarkably beautiful electrolysis involves stannous chloride [tin(II) chloride]. Really beautiful, feather-like crystals of tin metal are produced. Several electrolyses are shown in this Web reference.

Electroplating is an important application of electrolysis. Chromium and silver often are electroplated. Copper plated keys

Becker uses the small scale electrolysis of copper(II) chloride.