I marvelled exactly how patination is both art and chemistry; managed oxidation, acids

https://aged-wiki.win/index.php/Why_the_Hardest_Designers_Define_Copper:_Custom-made_Parts_That_Prove_Themselves_Over_100_Years

I marvelled just how patination is both art and chemistry; managed oxidation, acids, and waxes develop living coatings that progress with climate yet remain protectively secured.