The company I work for has a new building down on the coast. Because of the clientele we build boats for, the building has to look as good as the yachts themselves. In any case, they used copper for all the roofing and flashing and even gutters. They wanted it polished up, but by the time the workers got one section done, it started to turn this greenish/ blackish color. I am talking a matter of hours, as in they would start to polish at 7 AM, and by coffee break, it was starting to turn color already. In the end they said to heck with it, and let the copper just tarnish up.
So later, to match the tarnished copper of the roof and trim, they built a handrail out front. In order to match, they used Naval Brass. This railing was about 75 feet long and the cost per 10 foot length of pipe was 750 dollars. It took us 3 weeks to make and came in around 15,000 dollars for this silly handrail. That was an expensive choice of materials for two simple projects.