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A patina appearance is the end result of copper's aging process, but its debut entails a long wait. /p>
Copper patina is a description of the long-term effects of the atmosphere on copper. Over the years, some of the air's components attack the copper surface, causing an oxidation to occur. Many call this effect "weathering". In time, the weathering creates a patina coverage that resists these corrosive atmospheric components
The weathering process depends almost entirely on local climate conditions. For example, a wet environment reacts more quickly than a dry location. Indeed in extremely dry areas, the patina may fail to appear.
The bright copper appearance lasts only a brief time in most conditions. Usually within several months, the surface "darkens" and remains that way until around the fifth year. The "statue of liberty" tint does not make its entrance until around the 15th year or later. The small tinted inserts in the dormer photo illustrate these steps.
A clearcoating can block the effects of the air's components. The most effective period to apply clearcoat is in the early stages. A double application of a high quality clearcoating can block corrosive action for approximately ten years.