Examples include gold, platinum, silver, rhodium, iridium and palladium. The platinum group consists of platinum, iridium, osmium, palladium, rhodium, and ruthenium. It produces nickel, copper, cobalt, platinum, rhodium, ruthenium, iridium, gold, and silver. Most other metals like copper, lead, palladium and rhodium were precipitated with zinc. This reaction is catalyzed by some metals including cobalt, palladium, rhodium, and nickel itself. Diluted nitric acid dissolved all but palladium and rhodium. The precious metals inside the converter, including platinum, palladium, and rhodium, are extracted. The medal itself is rhodium plated. Tungsten, molybdenum, manganese, and rhodium salts may be reduced with lithium aluminum hydride. Initially the reflector unit was composed of electroformed nickel with a rhodium plating. Other noble metal-containing complexes used include ones with platinum, rhodium and iridium. Traditionally, hydroformylation was catalyzed by cobalt carbonyl and later rhodium complexes of triphenylphosphine. The reaction is catalyzed by cobalt or rhodium complexes. It is almost always made of platinum alloyed with rhodium for durability. Types B, R, and S thermocouples use platinum or a platinum/rhodium alloy for each conductor.