In electroplating, a metal coating is applied to an item of jewellery, for example, using electrolysis. Electroplating can be used to either result in a change in colour or also to create a harder surface finish. Rhodium-plating gives white gold a uniformly fine surface finish and hence improved brilliance. Rhodium-plating of silver prevents it from becoming tarnished (oxidisation of the surface). This technique can also be used for silver or gold-plating objects.