Louis: Both brasses and bronzes will probably develop a dull patina due to atmospheric exposure with time. With exposure to deicing salts, both alloys may also develop a green, copper chloride corrosion product film which may have to be removed periodically. The real answer also depends on which brass and which bronze alloys you are considering, as there are many brasses and bronzes, all with varying corrosion resistance properties to different media. Hope this helps! David Hendrix The Hendrix Group Inc.