A patina finish is simply the look of aged bronze or copper. This look is achieved through the oxidation of the surface of the material which produces a green sort of crust. A naturally occurring patina “finish” is not bad for the environment at all. You are probably referring to the artificially produced look involving paints. The scope of this question seems to become, then, whether or not paint is bad for the environment. Sounds like a good follow-up question to ask if you are interested…
Perhaps the best example of naturally occurring patina:
photo credit: William Warby
Hope this helps!
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