I was surprised just how patination is both art and chemistry; controlled oxidation, acids

https://www.livebinders.com/b/3716766?tabid=6bc29823-808e-6b09-47c8-56fe88625d45

I was surprised exactly how patination is both art and chemistry; managed oxidation, acids, and waxes produce living coatings that advance with climate yet continue to be protectively secured.