Modern Materials: Copper, Architecture's Natural Beauty

Talk about six degrees of separation! I was randomly looking at images of copper work on the internet and happened onto this site only to find a job that I did on here. I did the copper work on the Wnuk Spurlock house above. The homeowners had noticed copper tile wall applications around their neighborhood in DC (perhaps one of the Travis Price homes) and wanted the application for their home in California. At any rate some thoughts on the article and comments above: To clarify, the copper panels on the home are not book ending Cor-ten. The adjacent panels are untreated copper. But Cor-ten and copper do get along together. Unfortunately Cor-ten does not work at all in the marine environment and is highly unsuitable for use there.
As to torhaven's comment above, copper will not necessarily turn green ( I doubt there's much bronze in your roof), even in a marine environment, after nineteen years. It has more to do with air quality. An area like D.C. has aspects of acid rain and other areas where smog is heavy, like L.A. and the Bay Area can have impacts on copper patinizing. So the cleaner the air, the less likely it will turn green. You can turn your copper green if you want ( All of the pictures above feature treated panels) by having someone apply an acid wash. Most of the older patina on old buildings can be replicated as well for that lighter more opaque turquoise color.
And to toritrad: What you say is true about copper being very harmful to aquatic life although it is interesting to note that many homes (maybe even yours) have copper plumbing and many of us have been tested and shown that there is not much harmful from the plumbing. Very interesting.

simonasng: I forgot to mention staining of stone/concrete and stucco. It will stain them unless you use pre-patinized copper. The process is done in the factory and is more uniform then field applied patina. There used to be sources in the united states but there's only one factory left in Canada and the panels are very expensive (twice the price of untreated copper). I think the Coates Design above is pre- patinized and it doesn't appear to have stains on the concrete below. You can remove the stains by using a mix of 50% water and 50% muriatic acid. Apply and let sit for a few minutes and rinse with water. Don't leave on too long or acid will etch and eat concrete, stone, etc.

I actually really prefer the copper colour before it oxidises, is there any way to permanently preserve the original colour for siding?