Copper aging to patina

copper patina

A patina appearance is the end result of copper's aging process, but its debut entails a long wait.

What is "patina"?

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.

What are the color steps

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.

Copper aging during first year
The change of the copper paint finish over the first year.

Here is a photo of the bowl of a birdbath approximately four years after the application.

copper patina

What is clearcoating

A clearcoating can block the effects of the air's components on the copper flakes in the product.

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.

Apply as if you are applying nail polish--one pass with the brush. Avoid trying to work or push the clearcoat into the copper liquid paint

If there is a smudgy appearance, then the copper liquid paint was not cured.


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