House entrance with curved roof

Copper does turn green eventually without being near the sea, but it takes decades. Even by the sea, it first darkens; the patina then forms slowly. I cannot judge whether that happens faster or slower by the sea. But I know for sure that here the copper roofs on old houses are all green too, and they surely have never been by the sea, not even for a summer retreat.

"weird"...
I have observed so many that were NOT green ... but maybe not ripe enough? You probably need a few decades of patience

Hi

that often takes 50 years,
but for the impatient, pre-patinated copper is also available.



Olli

"pre-patinated copper" I will probably not be able to use, because the shape of the roof, into which the copper is supposed to be applied, is somewhat "complex." I assume that the patina will flake off during bending and in some cases maybe even during raising. But there are also techniques to provoke the patina on the finished roof with acid. My concern is more: I put a lot of effort and aggressive liquids into creating a green patina, and because of the composition of the air (I read about it in a book from around 1900) it will turn black again after two years. (you notice: I am not yet convinced that copper always turns green by itself, for that I have seen too many black copper roofs ... I pay attention to such things :eek

The book stated that since the beginnings of the Industrial Revolution, the atmosphere has allowed less and less green to develop. Therefore, in relation to green patina, proximity to the sea is mentioned more often because it apparently works better there. But there are also green roofs far away from the sea.