A solution is being applied to copper panels to accelerate patination (aging process for copper). Not enough time has elapsed to really bring out the patina in this video. However, in part two of this video, after more time passed by, much more patina develops.
What is patina? http://www.merriam-webster.com/dictionary/patina
Part 2: http://www.youtube.com/watch?v=nkpxhbzosmI