Show Tungsten and Platinum A A. simple test for distinguishing tm tungsten ten from platinum Is to heat hent the specimen to red lcd heat or above Platinum Platinum num nam nIll m remain unaltered Tungsten will wit be coated with a yellow oxide or ormay nay may even burn completely to the yellow yellow yel yel- low oxide If it Is essential that that the specimen shall not be destroyed In Inthe inthe the he test a n small amount of filings torn from rom the specimen may Day be heated with uh th aqua regia In a glass or porcelain re vessel el Aqua regia regla Is made up up by Sizing aj three parts of strong hydrochloric hydro hydro- acId with one part of strong nitric acid add In this test the tungsten lings dogs will be slowly converted to a ellow pow powder der Platinum will be slow slow If J f dissolved to an on orange red solution Itch bleh If evaporated with a small mount of sal sill ammoniac will yield fine ellow to red crystals If It the tho piaU um sm Ii la alloyed with Iridium as aa is U fre fre- neatly the case In material used for tor or for el electrical work the stack at st- act ack ck by aqua regia regla will wl be very slow |