The commonest use for copper sheet is on the exterior of a building, either as a roof or a facade.  It is also traditionally recognised as having a green patinated finish.  Normally this green takes about 35 years to accumulate.  Most architects today want a green finish, which appears natural, immediately.

Specifically for the copper roofing industry, Capisco has developed UNO.

SPECIFICATION:
UNO is available as pre-patinated coil or sheet. As seen below on the new extension at Tissot House St Johns Wood. Installed 2009. Photographed November 2011