Removes mineral grease and oil, oxide layers (e.g. verdigris), rust and lime.
The “passivating” action is based on the selective dissolution of oxidized iron atoms from the surface and the resulting increase of relative chromium content there. An eventual graying can be counteracted by addition of elma beizzusatz S1 to the passivation solution (ratio: concentrate elma lab clean S15 (ELC S15) : elma beizzusatz S1 = 10 : 1).