I was surprised exactly how patination is both art and chemistry; regulated oxidation, acids
https://www.tumblr.com/loftilynoisytwist/817275581910679552/from-blueprint-to-century-mark-custom-dormers-in
I was surprised how patination is both art and chemistry; regulated oxidation, acids, and waxes develop living finishes that advance with weather condition yet stay protectively sealed.