I was surprised exactly how patination is both art and chemistry; regulated oxidation, acids

https://telegra.ph/Copper-Doesnt-Lie-Why-Architects-Select-Salvo-Metal-Works-for-Custom-made-Chimney-Shrouds-that-Last-a-Century-07-02

I marvelled exactly how patination is both art and chemistry; controlled oxidation, acids, and waxes create living surfaces that progress with weather condition yet stay protectively secured.