quote:
Originally posted by ironlake2:
Could it have been to keep the brass bells from turning green inside and could be an indication that poor maintence was used on that by that road.
Brass that turns green (or brown) is not damaged in any way. Nor will it deteriorate other than having that tough, protective oxide coating. Shiny brass is done only for those who prefer the glitz and bling. Aluminum also develops a tough oxide coating like that. Brass, copper and aluminum do not 'rust' and deteriorate from oxidation like iron or steel does.
Witness the related Statue of Liberty, built in unpainted copper sheets that turn green on both sides. The only corrosion found when overhauling the statue was due to the use of iron and steel fasteners without some form of insulating their contact with the copper. Such insulation would reduce or eliminate electrolysis when dissimilar metals in contact with each other get wet.
So it's not really necessary to 'save' brass by polishing it. While indeed polishing does remove the oxide but it also takes away some of the brass as well, just like in polishing silver.
Ed Bommer