The name is derived from ‘rhodos’, or rose, because of the pink colour of its salt solutions. It was discovered in 1803.
Rhodium is very corrosion resistant and is often used in protective coatings on other metals. It is also used in electrical points, aeroplane engine points and fountain pens. Glass covered with a thin layer of Rhodium makes an excellent mirror, hence its use in car reflector headlights. Platinum and Rhodium are components in exhaust fume converters.