Rhodium mirrors and platinum mirrors are used when very hard and also chemically stable mirror coatings are required. The reflection of these two metals is lower than that of gold, silver or aluminium. However, their physical and chemical properties make them an ideal alternative for demanding applications.
Rhodium mirrors are frequently used in dentistry. Platinum mirrors are used in gas analysis, for example. Rhodium and platinum mirror coatings can be thermally vapour-deposited onto many materials