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

https://padlet.com/gobiikan56phhbi/bookmarks-nz34pcth9s8f6nwb/wish/PR3NWxqe8je1ab0O

I marvelled exactly how patination is both art and chemistry; regulated oxidation, acids, and waxes develop living finishes that develop with weather condition yet stay protectively secured.